Malicious PDF — malware analysis report

Static analysis result for SHA-256 865ec2ac4fae2710…

MALICIOUS

PDF

100.5 KB Created: 2021-03-29 09:04:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 71d5a43d8ee1bf67f94f7f5e147969df SHA-1: e55acf383394cedbd7955a21802440c5b8b351cf SHA-256: 865ec2ac4fae2710fc96918f152dec20f4aef97a78c7b9d7dc83532952462262
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, suggesting a link farm or SEO spam campaign. The document body, though heavily obfuscated, appears to be a lure related to an autopsy report. ClamAV and ML classifiers strongly indicate maliciousness, likely related to phishing or malware distribution via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • 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.
  • 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://jottigo.ru/123?utm_term=caleb+schwab+autopsy+report
    • http://trixy-matrix.space/i_do_1000_pushups_a_day1sf2d.pdf
    • https://vuginavoji.weebly.com/uploads/1/3/0/7/130775358/2344770.pdf
    • https://gawinesiti.weebly.com/uploads/1/3/5/3/135383431/96315ed1e45.pdf
    • http://site-shop.xyz/what_questions_do_you_get_asked_at_a_high_school_interview6csfy.pdf
    • https://xejinifinedi.weebly.com/uploads/1/3/5/3/135305438/91d57acb81.pdf
    • https://xewikoleruwi.weebly.com/uploads/1/3/4/8/134897031/9c918b753.pdf
    • https://zekabijixakosu.weebly.com/uploads/1/3/0/8/130813896/5432264.pdf
    • https://zuverikaniwofu.weebly.com/uploads/1/3/4/1/134108987/joxefa.pdf
    • http://redirunna.xyz/customs_declaration_form_cn22_239028d.pdf
    • https://rababavuve.weebly.com/uploads/1/3/1/8/131871532/jeninefotomubabem.pdf
    • https://vakupakofusiwu.weebly.com/uploads/1/3/5/3/135399484/gonoxexutovuzuri.pdf
    • https://sebupemisopuba.weebly.com/uploads/1/3/4/7/134706320/7876629.pdf
    • https://jijalasigode.weebly.com/uploads/1/3/4/3/134344414/48e01a8b3.pdf
    • http://investmag.org/fugijitigigilunulosafomavqay8.pdf
    • http://my-favshopd.online/aprende_electrnica_y_robtica_educativaef0bm.pdf
    • https://duvozogol.weebly.com/uploads/1/3/5/3/135314926/56ab1c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/rurosaveruk/how_many_stitches_per_inch_crochet.pdf
    • https://569961a5-e6b5-462d-8b38-7193d5e7b20b.filesusr.com/ugd/a37a2e_ea459151e5274f0bae206311fd8e09d9.pdf?index=true
    • https://s3.amazonaws.com/veraxawewib/deerfield_il_police_report.pdf
    • https://16564176-4c62-44d7-82e3-1dea6b832d73.filesusr.com/ugd/5e57cf_12b2398bf1004b858699458ceb8f8d85.pdf?index=true
    • https://s3.amazonaws.com/gazitif/85554868900.pdf
    • https://63995da9-74be-4895-8497-a4fa53c9845d.filesusr.com/ugd/788c84_aa857af71fcc49bd98cb560d5d513427.pdf?index=true
    • https://4465b75e-e642-4f53-8c89-e22f0b9d4994.filesusr.com/ugd/ecd213_3b8598d5e0064492b26f920b46b2b2a5.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014a6d.bin
6347d28f159afd0b7d4f4c1c92c1673ba15cae033e8030816aabfc84045b68a9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14A6D 5260 bytes
font_01_sfnt_off00015c57.bin
87bed7e82b6f4a7fd4e6da5270ecfa158dfbbb409e059b0c0feb44be3ceebdcd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15C57 11988 bytes

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