Malicious PDF — malware analysis report

Static analysis result for SHA-256 adb15b19764e70dd…

MALICIOUS

PDF

83.8 KB Created: 2021-04-07 21:41:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: e7e7477ed4c6db304408f0687383abdc SHA-1: 3976cc14a59488c9ba9f69da6d33140c61be6ae6 SHA-256: adb15b19764e70ddb3368de4ee0a6949855f8c1bbf68afc083428f33a467f02c
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external links, many pointing to disposable hosting, suggesting a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded URLs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://nipisod.ru/award?keyword=jurnal+pneumonia+pada+orang+dewasa+pdf PDF link annotation
    • http://aycotoro5.xyz/41899140860t90zt.pdfIn PDF document text
    • http://soldonlakewood.com/2689929531084mtw.pdfIn PDF document text
    • http://yourlivehelp.com/k_v_s_ki_full_formfwoya.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486982/normal_6063dda93a763.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4428335/normal_5fcb60da5ee08.pdfIn PDF document text
    • http://glossywp.online/kebuluzipyxh.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460450/normal_603532588ce17.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474736/normal_605282325daa5.pdfIn PDF document text
    • http://specrazreshenie.com/dopuridekagodaxagasifowa0q5w5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459623/normal_605aba9225e1b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://e4c06157-4c4c-4c30-848d-1ce07482e123.filesusr.com/ugd/99e070_0317506f661d4ac48df4c4363bf2b18e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/de14fb20-e578-4d8a-9d46-e1fbee5cc799/how_to_clean_jandy_pool_pump_basket.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf0be4f0-1d83-4a2a-a5c2-7423fb47df4b/vasepuxiriko.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/875e8867-8aca-4eef-80d2-2373e3c23355/how_to_reduce_diastasis_recti_after_pregnancy.pdfIn PDF document text
    • https://ea74ff18-003d-4094-8454-8d7e15e33abb.filesusr.com/ugd/50de67_9b366de4b9e6456dad98bff723ebfe34.pdf?index=trueIn PDF document text
    • https://ec8c99fd-5413-4e38-b6a0-2ccbba71fc6f.filesusr.com/ugd/de02f3_2afa74b0b8c149929b9f0e319789e619.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6fcef8c5-c9f7-4f13-b3e1-b378259dc050/eragon_book_series_for_sale.pdfIn PDF document text
    • https://02796127-04ec-4c85-b270-c6f7310ebb18.filesusr.com/ugd/ce0e6d_da16a29cb4d946cab60ea9707f9d9e52.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/de5a8437-0351-43d9-b76a-768f41e6a87f/basic_electrical_engineering_questions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec062944-9ecd-47a8-9472-0f9016dcb64d/wetupovanapum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/65e28b1d-afe5-472e-a67f-956d50a13299/nate_the_great_books_amazon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/29cc7ad8-134d-49b8-8b96-b737d3498131/how_to_pair_resound_hearing_aids_to_apple_watch.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e23cd2bb-8d8f-43d9-ba0b-16348a9f9b5e/13158639704.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/04ae7a65-a32b-4a63-9d59-b5a295d6345c/basic_english_grammar_exercises_for_beginners.pdfIn PDF document text
    • https://29159626-56e2-4eb2-a8c1-eb081f451e44.filesusr.com/ugd/a58502_051637208140407eaacc159d6b6f5b2b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/fda02f0b-019f-4383-84e0-b47bcce840e5/commercial_cool_mini_fridge_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e5048e18-811f-4282-b565-f8ef1f660557/high_anion_gap_metabolic_acidosis_litfl.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fd97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD97 5244 bytes
SHA-256: ca961c158fa88c03ba99f811fbfe9b6474004c1c9d7f720f5fca49919f5c3fac
font_01_sfnt_off00010f5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F5D 10344 bytes
SHA-256: a76ec8a54e1794b3bced2ecec6fcf0ef2ab7f23ade12d60bffdb9cb0716c85e9
font_02_sfnt_off00013279.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13279 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230