Malicious PDF — malware analysis report

Static analysis result for SHA-256 a92427e9409e7124…

MALICIOUS

PDF

83.5 KB Created: 2021-05-03 12:15:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 875e5b58648136c748a857eaa862404a SHA-1: 665bfad361482505137327a449a9cfc4f4d34ede SHA-256: a92427e9409e712487165c902e096ab8f99584ceaac2139af16cb5adb91fb903
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a large number of external links, many of which point to PDFs hosted on various domains, suggesting a link farm or SEO abuse for malicious purposes. One prominent URL, https://mezovuduw.ru/strik?utm_term=how+to+use+charcoal+face+mask+sheet, appears to be a lure, while another, http://tidofudavok.rf.gd/86026570442.pdf, is part of the link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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://mezovuduw.ru/strik?utm_term=how+to+use+charcoal+face+mask+sheet PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4401716/normal_6019236af2e8d.pdfIn PDF document text
    • https://wutowenejeboz.weebly.com/uploads/1/3/4/5/134599911/8782106.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495265/normal_6026c9e4305cb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367296/normal_600b3de48ea8f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491451/normal_6037f0bd7d0b2.pdfIn PDF document text
    • https://wubigunes.weebly.com/uploads/1/3/4/5/134507070/9304204.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
    • http://tidofudavok.rf.gd/86026570442.pdfIn PDF document text
    • https://73c25812-7308-4b32-b985-10e2a25710ca.filesusr.com/ugd/5b604d_64a43112822d425786e3863a1b051b0e.pdf?index=trueIn PDF document text
    • http://tafobinememen.epizy.com/91500292225.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4c38158-b733-4d10-818e-5f8bba1a8347/ipod_nano_2nd_gen_instructions.pdfIn PDF document text
    • https://s3.amazonaws.com/redegelesibif/vulalazafido.pdfIn PDF document text
    • https://s3.amazonaws.com/tinivukedeta/arishfa_khan_tik_tok_videos_sharechat.pdfIn PDF document text
    • https://s3.amazonaws.com/nerugiraxura/ladisulivefukiludowewu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/45145fa1-2ebd-46f5-9f15-76c0b698b25e/our_global_environment_a_health_perspective_8th_edition.pdfIn PDF document text
    • https://24218389-b518-4ca3-8548-65eaf758daa4.filesusr.com/ugd/c836c3_2c15e66376014d3699caae13ef561ee5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/89d7994b-a650-4911-8b07-067c4e635eff/how_to_connect_logitech_z150_speakers_to_pc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/08d4159e-3a0b-423e-a1c4-169347e6e05d/construction_project_site_specific_safety_plan_template.pdfIn PDF document text
    • https://5a6df620-610b-4d6f-8f1b-71e936bb70bc.filesusr.com/ugd/1f5cef_d758aa400d6d41b6b5174487690ac153.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wuzalugiseto/31675812230.pdfIn PDF document text
    • https://s3.amazonaws.com/jobavo/vasufifomulob.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_off0000f915.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF915 4964 bytes
SHA-256: b5c0d957377076ef9b455721008c0c4b6686ad022c831f8be6cd028a6821f3a5
font_01_sfnt_off00010a0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A0F 11492 bytes
SHA-256: 619fe4637079a52ffa11d72097ee36ea4a5319e66c13d4ef6321a1fd849bd2ea
font_02_sfnt_off000130c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130C3 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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