Malicious PDF — malware analysis report

Static analysis result for SHA-256 a16d2dd2f188c106…

MALICIOUS

PDF

107.2 KB Created: 2021-04-06 22:51:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 57a3a93314e78c526c076b8725a52511 SHA-1: ce79ee978fc7a393aba09ae1557e4cac4f75c5a8 SHA-256: a16d2dd2f188c1067f78b840ddc3c6eb328ba305638b70658338913ae0204ffb
134 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. It uses an urgency-based lure. 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 0.9985

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 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://resalured.ru/123?utm_term=customer+engagement+plan+template PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4374847/normal_6063acabadfbd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412403/normal_5fefdfd23fc09.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415530/normal_6067fd56d0d49.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402297/normal_6002605b67c07.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496404/normal_602e6e004320a.pdfIn PDF document text
    • http://sokadap.22web.org/ballistic_galvanometer_seminar.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://s3.amazonaws.com/sosupejuxofedo/secondary_drinking_water_regulations.pdfIn PDF document text
    • https://s3.amazonaws.com/pululusodogi/diablo_1_belzebub_character.pdfIn PDF document text
    • https://dc6b22d1-fd3c-476a-b8f1-b0505981f591.filesusr.com/ugd/ab5adf_8e8d5875cc0f45f3857e156f9f8f7ea9.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jivagajamav/best_answers_for_long_term_career_goals.pdfIn PDF document text
    • https://s3.amazonaws.com/saziwijaxodav/imbuement_guide_tibia.pdfIn PDF document text
    • http://tizepadeda.rf.gd/rokujikimikix.pdfIn PDF document text
    • https://s3.amazonaws.com/pesetufavo/32318250129.pdfIn PDF document text
    • http://tumofif.rf.gd/86419736289.pdfIn PDF document text
    • http://nexavej.rf.gd/47715636890.pdfIn PDF document text
    • https://9e2bb560-353e-4f5d-a08b-1363560edab4.filesusr.com/ugd/6c032c_03954a05e30e43e9b499939330d0b07c.pdf?index=trueIn PDF document text
    • http://kexasejuwodeji.epizy.com/91977777880.pdfIn PDF document text
    • https://d23eb412-52e1-45ef-a32a-0c032022daee.filesusr.com/ugd/03485a_6ded673c671248c88a466d3406ff4e13.pdf?index=trueIn PDF document text
    • https://8533cbf3-c0d6-400c-bdf8-8ca38cf0242b.filesusr.com/ugd/135178_4623a35f7b88404cb1b65f69174701cf.pdf?index=trueIn PDF document text
    • https://006b50d4-ad2a-4261-8279-34542eb0d7b0.filesusr.com/ugd/a640e9_237584f252cd4a10a4316ef7ceda750c.pdf?index=trueIn PDF document text
    • https://7f3356c1-ec1f-498a-9d41-5b36c14d87b7.filesusr.com/ugd/98d33d_7f80c50936aa414bbb3b7b516a0d9268.pdf?index=trueIn PDF document text
    • http://dojanipono.rf.gd/adobe_photoshop_sketch_for_windows.pdfIn PDF document text
    • http://rorewoj.rf.gd/leadership_teamwork.pdfIn PDF document text
    • https://41c240d9-b4af-4f88-8fa4-2a41cce3a287.filesusr.com/ugd/01bc73_6254c9611e7a4ff5a71c3dd94653fd50.pdf?index=trueIn PDF document text
    • http://zoridod.epizy.com/dofufagomigoxire.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_off000155d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x155D7 4996 bytes
SHA-256: 775217a28567403d5467106f118a49a02fe96b9bd2a633d662cede15b5aeef88
font_01_sfnt_off000166bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x166BD 12032 bytes
SHA-256: 03eb24907a6c0389657d6a3cd80794a2304a6557cd7fe9ef5319d7f3a49e59ac
font_02_sfnt_off00018ef4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18EF4 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34