Malicious PDF — malware analysis report

Static analysis result for SHA-256 de891fbcb5ceb7ee…

MALICIOUS

PDF

78.7 KB Created: 2021-03-19 19:47:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 187055c465619676879e44b37b03df8d SHA-1: bd8bec67c4ef251983ef2bde41f14f1f983f92dc SHA-256: de891fbcb5ceb7ee10b7a0b53b865f2548e924e19ab72a7dab11b52fc9f1bac5
186 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which are hosted on disposable domains or use UTM parameters, indicating a link farm or SEO spam operation. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://leonvi.ru/aws?utm_term=htc+one+mini+xda PDF link annotation
    • http://wisecredit.info/simelaxamuf3thw.pdfIn PDF document text
    • http://peskomment.ru/89983015337ps7i1.pdfIn PDF document text
    • https://widowajezow.weebly.com/uploads/1/3/4/5/134584852/758022.pdfIn PDF document text
    • http://xuribof.medianewsonline.com/how_to_know_if_your_motherboard_is_compatible_with_cpu.pdfIn PDF document text
    • http://jakartapro.xyz/beetle_bailey_comicsmiieu.pdfIn PDF document text
    • http://rodina38.ru/how_to_write_electronic_configuration_of_f_block_elements46a2t.pdfIn PDF document text
    • https://vubufogos.weebly.com/uploads/1/3/4/7/134766152/kuwur-nolumiwemonul-junuvivugubun.pdfIn PDF document text
    • http://iranomics.com/manual_de_chery_tiggo_20154a7mb.pdfIn PDF document text
    • http://lojasamericanasbr.com/nicomachean_ethics_book_1_chapter_5_summarynpwjh.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://7e073981-ad1c-4081-8dc0-76946ba36063.filesusr.com/ugd/c4f63d_d2b0495012b14c7c8f6487cbcdc9491d.pdf?index=trueIn PDF document text
    • http://muvemaxadal.onlinewebshop.net/piboxi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a8aedb19-e9e7-409e-91dc-1521ec484fb0/yamaha_rx-v775_specs.pdfIn PDF document text
    • https://f55c6975-0091-4942-a106-dc80285e5f9d.filesusr.com/ugd/8a4248_69c224d641884a27b226f18534511c97.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/33bdb631-c34b-4184-951c-7a0cf88cbe7a/citizen_eco_drive_gn-4w-s-12g_manual.pdfIn PDF document text
    • https://f39f7cea-6337-46de-af4f-699959e6db0a.filesusr.com/ugd/004672_dd22a03309e04f608283a063a928b7a3.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a6507be-8393-4d7b-9469-d9bef81f2efb/thinking_like_a_lawyer_colin_seale.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fbd8180d-7463-467e-bda5-c2fbdee0a938/venare.pdfIn PDF document text
    • https://e97408dc-4b05-4e3b-9f19-f4127feb49ef.filesusr.com/ugd/a42eed_f7ceb802e31d499681dced9e9521a530.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c8ae7458-0d01-45fe-80c1-56785c857c5d/kitchenaid_food_processor_manual_kfp0711.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_off0000f93f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF93F 4808 bytes
SHA-256: 81bd518b64391f82a27620263bf627284157f5ab9dc17653f88a9fdacbacb909
font_01_sfnt_off00010988.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10988 10680 bytes
SHA-256: 334d6a1be537f261a692ea202aa4311ca590dd902eff4c2a61c35a64d8d1f544