Malicious PDF — malware analysis report

Static analysis result for SHA-256 3edf8b913bf65434…

MALICIOUS

PDF

80.4 KB Created: 2021-04-14 09:34:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: d8f30dcd1656a83f14a9559950a4f652 SHA-1: dae5e6949dc535b1defb4a7a46ae360821dcd8c3 SHA-256: 3edf8b913bf65434f02436ecdee2a3e4e69bf3ccb206f4c1563b2e2df1615eef
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 0.9994

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/strik?utm_term=how+to+write+my+employee+evaluation PDF link annotation
    • http://pufivuziviv.mypressonline.com/how_to_clean_philips_respironics_nebulizer.pdfIn PDF document text
    • https://xukusoresi.weebly.com/uploads/1/3/4/4/134488105/210405.pdfIn PDF document text
    • https://kafazuvowimi.weebly.com/uploads/1/3/4/7/134705673/zuzidubukusa.pdfIn PDF document text
    • https://vodunifowabot.weebly.com/uploads/1/3/5/9/135992931/267f27c.pdfIn PDF document text
    • https://cdn.sqhk.co/xeloxilava/hehhgia/marketing_plan_definition_business_dictionary.pdfIn PDF document text
    • https://cdn.sqhk.co/winogolelog/idijPvm/ben_coloring_10_ultimate_alien_cosmic_destruction_apk.pdfIn PDF document text
    • https://wafukereloxajof.weebly.com/uploads/1/3/5/3/135311523/lukekuzoxanin.pdfIn PDF document text
    • https://cdn.sqhk.co/ravusigi/BjeGUBA/76755698166.pdfIn PDF document text
    • https://kumojazoj.weebly.com/uploads/1/3/1/3/131381946/fanimapunirexaf-tuxemiduto-zufowolozeg-kosoxofenipope.pdfIn PDF document text
    • https://kinigapiluxuke.weebly.com/uploads/1/3/4/8/134863840/xudokefebo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389793/normal_5ff28949618bf.pdfIn PDF document text
    • https://vetaroxavobu.weebly.com/uploads/1/3/4/4/134441067/sabum.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448991/normal_602237de813cc.pdfIn PDF document text
    • https://mefomenixa.weebly.com/uploads/1/3/4/2/134235772/vumifowatov.pdfIn PDF document text
    • https://wexejejide.weebly.com/uploads/1/3/3/9/133986252/venazawukokevu.pdfIn PDF document text
    • https://namoniwuxixipej.weebly.com/uploads/1/3/4/6/134606628/pigomemukisan.pdfIn PDF document text
    • https://cdn.sqhk.co/vuvupewog/Qgccj6c/earth_now_and_then.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379961/normal_601146cde3269.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://bf808793-8b46-4c54-8b11-319763181fa0.filesusr.com/ugd/0d018b_5563f2299ce4496ba774bf34bda57b2b.pdf?index=trueIn PDF document text
    • https://c31d65df-273c-4bcc-acfb-7b03b0724b99.filesusr.com/ugd/e7e4a0_ce7ad5a6619e4a9e9e2551449026c3d2.pdf?index=trueIn PDF document text
    • https://59b17237-83b3-47c6-9d40-f547da5b0434.filesusr.com/ugd/827194_b02307880169439a9a2e86d29d20e49c.pdf?index=trueIn PDF document text
    • https://77cbb24c-feae-490b-854c-0a9d4db21a85.filesusr.com/ugd/3752ea_86a11dbf0cb1466282f3afc8111fbe47.pdf?index=trueIn PDF document text
    • http://logiweliziweje.onlinewebshop.net/46005393763.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_off0000ff12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF12 5004 bytes
SHA-256: 042bd36d992ff2d3fbb89a80b8197aa5e9baa803950e8be74dbcc1e31e8a1bb0
font_01_sfnt_off00011016.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11016 10544 bytes
SHA-256: 8e178e69e8253491bf81c9722688715919b43be1a5aebea6935f577bb63bef42