Malicious PDF — malware analysis report

Static analysis result for SHA-256 c176dd82d01e90e7…

MALICIOUS

PDF

71.4 KB Created: 2021-06-09 22:06:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 0c0fd84c538bbf87a11e5bfd178b8991 SHA-1: e9c9923264ac1c03b783380d2658866385916276 SHA-256: c176dd82d01e90e72e499c8309bbf758bb2a07e436163cd898944f6040c22adf
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9991

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 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://cructi.ru/pbw?utm_term=all+formulas+in+physics+class+11 PDF link annotation
    • https://bekogome.weebly.com/uploads/1/3/1/4/131454098/e542aadae5b2456.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501660/normal_5fc79d348ee74.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453103/normal_600cc1c58e392.pdfIn PDF document text
    • https://dexonakupo.weebly.com/uploads/1/3/4/6/134644734/8ac1c4176b4f379.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418180/normal_6027d950a0a4e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368751/normal_5fd6e069ecf50.pdfIn PDF document text
    • https://vukexelisijaka.weebly.com/uploads/1/3/1/0/131070195/ad9614932f4790.pdfIn PDF document text
    • https://koponabunabo.weebly.com/uploads/1/3/4/5/134520941/7929574.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4371265/normal_60b2d13eea258.pdfIn PDF document text
    • https://lefoxidegej.weebly.com/uploads/1/3/4/5/134526886/7309373.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418566/normal_5fecb02f61cd1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419194/normal_602ba02fe4e3d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413566/normal_5ff4aac8f0213.pdfIn PDF document text
    • https://dowixedazu.weebly.com/uploads/1/3/1/4/131409709/jutikowamusikowepudi.pdfIn PDF document text
    • https://gapuromediwav.weebly.com/uploads/1/3/0/8/130814643/299be.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://supulilofib.pbworks.com/f/81676856080.pdfIn PDF document text
    • http://xobapotowi.pbworks.com/f/motu_aur_jodi.pdfIn PDF document text
    • http://xifatarege.pbworks.com/w/file/fetch/144949149/www_filmywap_movie.pdfIn PDF document text
    • http://fokojifidesi.pbworks.com/w/file/fetch/144816909/18321214243.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/55162139-c661-4fa4-ba7f-bc0f3b90a825/rockler_complete_dovetail_jig_video.pdfIn PDF document text
    • http://lorugaz.pbworks.com/f/rob_nixon_slow_violence_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/17fd44cb-885e-4250-8f6b-91a80d2f4200/take_2_tablets_twice_a_day_means.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fdb4c653-ee4c-4e34-9277-d7cd4dda8760/can_you_use_ps_gold_headset_on_pc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dea3fe94-7dd3-4cfd-a73d-cd05e7f50728/duvowazuvuledasesobazu.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_off0000daaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAAA 5396 bytes
SHA-256: b3ab11cf4da10d3dc2d2708d126c0fe1306094924b9e0ac566f67db73d5b6454
font_01_sfnt_off0000ece8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECE8 10344 bytes
SHA-256: 5f98849fb078801c26b27062e87d5ded35a2740a8e7f1eaa88414a74f69d2eee

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