Malicious PDF — malware analysis report

Static analysis result for SHA-256 76cbc57918c56eb3…

MALICIOUS

PDF

75.7 KB Created: 2021-06-14 09:05:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 99bf84210077d0a99877e2e38bd295fc SHA-1: 078ae4b5d89f5387587466e1744d2d8cfcbbbe95 SHA-256: 76cbc57918c56eb32a24708938f78f4e96f0252ff9061bc39dbd018723533af6
186 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 by multiple heuristics and a machine learning classifier as malicious, specifically as a phishing or link farm document. It contains a large number of external links, many pointing to disposable domains and Weebly-hosted PDFs, suggesting a link farm or SEO spam operation. The ClamAV detection of 'Pdf.Phishing.Trojan' further supports this assessment. No scripts were extracted, but the PDF structure itself facilitates the attack by hosting numerous URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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 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://archism.ru/pbw?utm_term=poisson+probability+distribution+questions+and+answers PDF link annotation
    • https://xemexetizepe.weebly.com/uploads/1/3/6/0/136094173/tupomokuzimopa.pdfIn PDF document text
    • https://jawebufor.weebly.com/uploads/1/3/4/6/134647112/fadd162404e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476268/normal_5fe0d6d233850.pdfIn PDF document text
    • https://susopusamug.weebly.com/uploads/1/3/4/3/134336197/zokitabumita.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454691/normal_60001337798eb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386336/normal_601af098a90c4.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4491173/normal_60b6ebab8057e.pdfIn PDF document text
    • https://pobanofesu.weebly.com/uploads/1/3/1/3/131398475/wekimitexul-kawoto.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378848/normal_605f80d656d02.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408177/normal_5fdaef385c9c2.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://feselikebapu.pbworks.com/w/file/fetch/144918144/tusoxisale.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/835126a8-7984-44cf-9cb5-ab97f76f08d8/50887284643.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b771a774-95ff-4d77-8e50-c615c0c82e39/53279728631.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/54a52aba-59e4-4df8-8f27-4d47a90955e0/how_long_do_wax_melts_smell.pdfIn PDF document text
    • http://gebozuj.pbworks.com/w/file/fetch/144852444/lasusasowupekidesubaleju.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5e23087-2535-4b62-a8fe-098cc6b7052c/shaolin_soccer_english_dubbed_download.pdfIn PDF document text
    • http://risuxujuvu.pbworks.com/f/polaris_sportsman_500_electrical_schematic.pdfIn PDF document text
    • http://fuvuxagola.pbworks.com/w/file/fetch/145115931/pepesilutotevugefelok.pdfIn PDF document text
    • http://bopidix.pbworks.com/f/solasiriv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a59fcb57-10e4-45a5-99b8-016f845b7bf2/how_to_fix_my_kenmore_ice_maker.pdfIn PDF document text
    • http://gitefov.pbworks.com/w/file/fetch/144465822/tiffany_lamp_shade_replacement_for_floor_lamp.pdfIn PDF document text
    • http://kufujibumufa.pbworks.com/w/file/fetch/144671445/ejercicios_resueltos_funciones_lineales_a_trozos.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_off0000d942.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD942 5296 bytes
SHA-256: fb08b9fb09bdf0854eb3249c00f6061c9e5ccd770b8540d7891616dc341ee6b1
font_01_sfnt_off0000eb4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB4B 11536 bytes
SHA-256: d8427c67348c04d8b83a31dcaf575fc2a638728d7bfcd3cb84ac4c4c57f49c5a
font_02_sfnt_off000112ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112AC 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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