Malicious PDF — malware analysis report

Static analysis result for SHA-256 16704052827ccb19…

MALICIOUS

PDF

77.3 KB Created: 2021-03-08 12:09:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 69b07bb7475f28fcd2bd7becbebca57d SHA-1: 089ff88ce7d8dd54307d0131b6ed5b3b9d8cefa4 SHA-256: 16704052827ccb199b5a68e2224dc97d6f451c39c4bcc62486374914f1049361
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document flagged by ClamAV as a phishing trojan. Heuristics indicate it contains links to known malicious redirector infrastructure, specifically 'https://dafemum.ru/award?keyword=connectors+in+english+pdf'. The document also functions as a link farm, directing users to numerous external PDFs, some hosted on disposable domains, increasing the likelihood of a phishing or malware distribution scheme.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/award?keyword=connectors+in+english+pdf In PDF document text
    • https://cdn.sqhk.co/kasesiseb/Fii1kNr/weather_forecast_for_tonight_in_chicago.pdfIn PDF document text
    • https://cdn.sqhk.co/dalubevemex/tu6icjf/ramimanajulom.pdfIn PDF document text
    • https://tematurulabi.weebly.com/uploads/1/3/1/6/131606540/0d4de33d04081.pdfIn PDF document text
    • https://dexidexida.weebly.com/uploads/1/3/4/2/134235246/479ed82e714712.pdfIn PDF document text
    • https://cdn.sqhk.co/vujenibolo/cFCm5hj/midozapikixotuxojavaj.pdfIn PDF document text
    • https://dekedenavit.weebly.com/uploads/1/3/4/6/134612093/8eeb3d5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://27a83426-c768-4525-a63d-b5b732cca755.filesusr.com/ugd/28b3f7_1cca0a174da144bbaf6cfddac3e98040.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/49085133-d544-4cce-9a81-ec5e2d554295/razumotivo.pdfIn PDF document text
    • https://e437b920-fa79-41d5-b67c-0ca059f4e77a.filesusr.com/ugd/d97c10_bbe14754713746049b45ab077e7403c8.pdf?index=trueIn PDF document text
    • https://4993f9ff-345c-4c03-a8ec-d4f8dac664d6.filesusr.com/ugd/debbe1_634c1099713740c1bc9e44754b29bdab.pdf?index=trueIn PDF document text
    • http://midelex.epizy.com/developmental_delay.pdfIn PDF document text
    • https://97a45c9e-1ab5-462a-bfe2-fded34b9a8b9.filesusr.com/ugd/b50c55_b4fa2feb62bb4073815213ec4b9113ba.pdf?index=trueIn PDF document text
    • https://28f2c00a-638b-45ec-8848-4d649cb6aba9.filesusr.com/ugd/946f28_530433bb68224f47b9a02a024aa750d3.pdf?index=trueIn PDF document text
    • http://barajolu.rf.gd/little_shop_of_horrors_full_cast_list.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a4dd3be-952d-4e16-9117-a4891886455c/amazon_operations_manager_resume_sample.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_off0000f37d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF37D 5112 bytes
SHA-256: f65ce57ed09b298a8e6511453c9b2580d1026eef1a9774c902fedd087e05a33d
font_01_sfnt_off000104dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104DD 10832 bytes
SHA-256: a13903d0fc57d97152ec2a52e5ed778f1451c368e846b543353b5f1658571a47

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