Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d41f1c9f2f2c5a4…

MALICIOUS

PDF

80.8 KB Created: 2021-03-19 14:27:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 284e130450a3b902dbc790022a1ad67f SHA-1: a89c63b58c9efc0135fa2eb514310a06c1b0f46c SHA-256: 6d41f1c9f2f2c5a48897730f16c6a8125dba1047ec85aefe9d44f78225ef64b5
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan. It contains numerous embedded URLs, many of which point to disposable hosting or unknown domains, suggesting a phishing or malware distribution attempt. The document body, though heavily obfuscated, appears to be a lure related to academic referencing, designed to trick users into clicking malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://golowaki.ru/strik?utm_term=how+to+reference+a+radio+interview+in+apa+style PDF link annotation
    • http://bostpolamos.site/96759474246u69rw.pdfIn PDF document text
    • http://pomirkapa.site/lemowa1zy2.pdfIn PDF document text
    • https://cdn.sqhk.co/niwuwusogoxo/cihgdr2/20040890443.pdfIn PDF document text
    • https://cdn.sqhk.co/janonaset/9ibibhg/63410579143.pdfIn PDF document text
    • https://cdn.sqhk.co/letarezetap/CvgiczF/ragaduwojak.pdfIn PDF document text
    • http://ygrash.website/17985616054ce5fh.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461744/normal_6022bae62efd9.pdfIn PDF document text
    • https://cdn.sqhk.co/kubabulukod/lWhgpjy/33640066031.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409630/normal_5ff666b5d361d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371272/normal_600a48faeedd2.pdfIn PDF document text
    • http://cabinetshub.xyz/aeron_weight_limituj2yo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387408/normal_600a82d94f03a.pdfIn PDF document text
    • http://hookup157.fun/escrever_frmulas_matemticas_online4j1oc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://b6de9e3f-c562-4e05-b5ee-70895c8060ae.filesusr.com/ugd/3801ff_c49aa781011e481d82ea1629260db1bc.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d08d62bb-79ed-4118-a4e3-a9c2c729afff/object_oriented_programming_java_coursera.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/85c28544-58a1-485a-a912-618617c59b55/tuvosologezegolavegosa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a38497dc-6094-4820-97c5-1c88d978af05/26404573079.pdfIn PDF document text
    • https://ca7c05ed-d233-4774-9cf9-08ff86aa6c73.filesusr.com/ugd/b42fd6_d99e9c3c532a4ba28dbfffe29e6c036c.pdf?index=trueIn PDF document text
    • https://95a83a18-022f-4aa5-9dc2-588eac4c5c4a.filesusr.com/ugd/ccb6ab_366fd2a22623456d8d5909ae4de2c0d1.pdf?index=trueIn PDF document text
    • https://bd7a0a6f-bbfd-49cc-ba41-c3f2778102d9.filesusr.com/ugd/9ea91e_8f06830ced384a5381e10b8addd0d04b.pdf?index=trueIn PDF document text
    • https://9b08d158-0e0f-4203-9b31-e1272d977b1c.filesusr.com/ugd/086daf_6c4762540dca4e4eb04af676a1a37a91.pdf?index=trueIn PDF document text
    • https://438e95ed-c264-4db5-88d3-1a9ca8b91b86.filesusr.com/ugd/733c1f_76e472b8eea84bc79511cf6f92f8d829.pdf?index=trueIn PDF document text
    • https://550dfcec-0280-4316-a0d5-68b74a7a20b9.filesusr.com/ugd/f59309_2ed548eb16ae4e9689207454a6a584e2.pdf?index=trueIn PDF document text
    • https://2a4065d7-883d-43e8-a524-7ce9aa4b4e88.filesusr.com/ugd/ccb1c6_f1ce00d40f944cac9932470f99a5891b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d212970d-7a66-4549-adf9-0f885a2ff635/bagujimurisuzukosidive.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_off0000ff85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF85 5364 bytes
SHA-256: 894dfc215d2d462f2b6855261c6e6bc560b5c1d4d1dce8b86027181ddcb3afb9
font_01_sfnt_off000111f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111F2 10420 bytes
SHA-256: bfd115b4ed788589448aff366edd567d5850734c1c7fb85defd43ad7fbb2412f