Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea92b13cab0914a0…

MALICIOUS

PDF

85.4 KB Created: 2021-06-06 08:20:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 0063a44055315c15b2f4ac7d3a0ced56 SHA-1: e8f3079fed9ba92d0159e02518e03266d15ba9a5 SHA-256: ea92b13cab0914a0663f5fbf2fca2b8ca7eef903812e13d6fd287673d9fb30a0
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 hosted on disposable domains or using UTM parameters, indicating a link farm or phishing lure. ClamAV and ML heuristics confirm its malicious nature, specifically flagging it as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://laborke.ru/pbw?utm_term=how+to+pair+soundpeats+truengine+3+se PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4459166/normal_5ff7944321b1d.pdfIn PDF document text
    • https://lejuziluzamof.weebly.com/uploads/1/3/4/8/134863123/lifurupu_vitajizuxeku_zabuvoku.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418381/normal_6067c4e5a2559.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471083/normal_601d14c826cdc.pdfIn PDF document text
    • https://duvutonog.weebly.com/uploads/1/3/6/0/136020002/8984836.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4492593/normal_5fe4b57d8a588.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488103/normal_6057c07e78a1c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388276/normal_5fff0cbd1d461.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446374/normal_5fdb8a07ac4dd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417535/normal_5fffdbbc0f9af.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459629/normal_5fde16b174747.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461216/normal_6033dbb5b7eeb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374522/normal_60531cbdbe274.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458616/normal_5fd04f29890b0.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://gitefov.pbworks.com/w/file/fetch/144451797/gikemudaboporamuzuwuxi.pdfIn PDF document text
    • http://furalagaposu.pbworks.com/f/kubinufopi.pdfIn PDF document text
    • http://tujezowosop.pbworks.com/w/file/fetch/144671829/cell_phone_text_tracker_app_free.pdfIn PDF document text
    • http://rugewenuzed.pbworks.com/f/tebuzesoguretotomogufi.pdfIn PDF document text
    • http://jowenoxo.pbworks.com/w/file/fetch/144549090/playstation_3_remote_app_android.pdfIn PDF document text
    • http://moxulolo.pbworks.com/w/file/fetch/144452151/28468917345.pdfIn PDF document text
    • http://kigemulu.pbworks.com/f/12320296080.pdfIn PDF document text
    • http://sujagajo.pbworks.com/f/download_dumpper_and_jumpstart_full_version.pdfIn PDF document text
    • http://disisopaz.pbworks.com/w/file/fetch/144658029/60294348230.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e274.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE274 9136 bytes
SHA-256: 5738a8714ce2efe759c247028eb8a22be18084138b130b256f475d88dfdee79e
font_01_sfnt_off000100b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100B1 5192 bytes
SHA-256: 95770f3204fc67f4294b1e712db99018aec1f251e5b2cd581ae32a8aac144fd2
font_02_sfnt_off00011272.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11272 11620 bytes
SHA-256: 2573d64ba073628ccc34bb98e31b447c8ee8a48eef43e073fa1eb0153f49783b
font_03_sfnt_off00013980.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13980 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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