Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d17e6184a2e9a83…

MALICIOUS

PDF

82.0 KB Created: 2021-06-08 20:34:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: feefd4d07f29486fd6d524d4d52a3c9c SHA-1: b6e7ee96c51aebe3c2fa42545907c57536a67053 SHA-256: 3d17e6184a2e9a83c45b36094a4f83d8f402726c37f9d3da7d83642b5cb51f43
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://archism.ru/pbw?utm_term=sample+essay+ielts+writing+task+2+general+training PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4409411/normal_5fdcf5059d17c.pdfIn PDF document text
    • https://gewaxuselez.weebly.com/uploads/1/3/4/2/134265722/4003751.pdfIn PDF document text
    • https://tatuxosigataban.weebly.com/uploads/1/3/4/7/134770737/fofebimaruso_vijojipof.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378845/normal_5fd96db379fbc.pdfIn PDF document text
    • https://kiradaropamun.weebly.com/uploads/1/3/1/0/131070158/funujogamaxerezas.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4472763/normal_6008e665a0130.pdfIn PDF document text
    • https://gamabisage.weebly.com/uploads/1/3/2/6/132681080/nibobajesiker.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381962/normal_6063570e3dbdf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381090/normal_5ff28020c665f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418570/normal_6059e6453b0f1.pdfIn PDF document text
    • https://dejalujufoleto.weebly.com/uploads/1/3/1/3/131378776/5555f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/07476474-84be-4dc6-b98e-4f35ae903782/what_can_i_do_to_jumpstart_weight_loss.pdfIn PDF document text
    • http://zekapotog.pbworks.com/f/tere_bin_nahi_jeena_mar_jana_dholna_dj_song_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa12798f-178c-44c7-9d49-584a1d517b63/analysis_of_the_play_a_dolls_house_by_henrik_ibsen.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/274ba36e-0b06-4545-86c7-b9f6cfd37bbe/mathematical_proofs_a_transition_to_advanced_mathematics.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f5605e5-2c51-40f4-9628-2a0c5582b25e/tu_eres_digno_de_gloria_icz_worship_letra.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dbeb5e50-a98e-4aa6-a3cd-c8953d3b5587/which_nespresso_vertuo_pods_are_best_for_latte.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/330711af-b4bd-40cc-a17b-ef32a5300688/how_much_does_a_hyundai_i30_service_cost.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/12c73114-253d-49ff-9f3e-619d5788cc0e/how_do_you_play_jeopardy_in_the_classroom.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0963eb99-b573-444c-b090-7ebfde9aef19/the_boy_in_the_striped_pyjamas_guided_reading_questions.pdfIn PDF document text
    • http://vatojorisa.pbworks.com/w/file/fetch/144443328/romonomusivitexob.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/624c4506-52c6-40c8-a12f-40c9ca1c548b/magic_school_bus_intro_song_lyrics.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000102c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102C0 5632 bytes
SHA-256: 73c8b4c7da23e1fff127aa0a1b7190382e8c43cc31a5b52a70a9c28583ea8756
font_01_sfnt_off000115f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115F3 10584 bytes
SHA-256: 3e69c03ddd101d2757b66276ee8f9d0a1abe9f71fd3801c762d2c574216b8a3a