Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea5588c500c9d2d6…

MALICIOUS

PDF

81.5 KB Created: 2021-03-09 01:00:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 918e8aa90fae644659133e6a8eb61b76 SHA-1: 25bd17cc6a8abce6e51b57c36bdfc00988ef634b SHA-256: ea5588c500c9d2d6bbc60893b8c5efb1f70a2edee2641384c00bb5e897b655e2
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable domains and hosted on services commonly used for link farms. The heuristic 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicate this is a link farm designed to drive traffic to various sites, potentially for SEO manipulation or phishing. ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent, likely related to phishing or malware distribution via the linked URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://mezovuduw.ru/strik?utm_term=excel+formulas+not+updating+when+sorting PDF link annotation
    • https://cdn.sqhk.co/sunaxidida/hciiick/rebuild_synonyms_dictionary.pdfIn PDF document text
    • http://werikipirojenob.scienceontheweb.net/12783928432.pdfIn PDF document text
    • https://cdn.sqhk.co/bepigulusibe/hjAJhiJ/2728594538.pdfIn PDF document text
    • http://vixabaj.scienceontheweb.net/12070258969.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4493245/normal_5fc9be15c3f39.pdfIn PDF document text
    • https://cdn.sqhk.co/tewokozogop/9gjnwrm/pubg_name_font_generator_with_symbols.pdfIn PDF document text
    • https://cdn.sqhk.co/juvanejejuwo/iizijgj/4656833342.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388613/normal_5fcd518b1414e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407313/normal_60178d573163b.pdfIn PDF document text
    • http://pasikufopubiwo.mypressonline.com/zabunopo.pdfIn PDF document text
    • https://cdn.sqhk.co/jitegoji/hbjbdK4/parental_monitoring_apps_for_iphone.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489402/normal_5ff605edeed11.pdfIn PDF document text
    • https://cdn.sqhk.co/xefilelo/7Q6QFjf/wechat_app_download_for_windows_phone.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369794/normal_604201040d5db.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
    • https://s3.amazonaws.com/nefomojuwet/jio_filmfare_awards_2019_full_show.pdfIn PDF document text
    • https://ad0d0dbb-669b-46a9-85df-79487014a0f3.filesusr.com/ugd/00d95d_7d370db320494e68aa3294320d077ce5.pdf?index=trueIn PDF document text
    • https://1138278f-e8d0-45ef-aef3-dbdd7428ac52.filesusr.com/ugd/5be868_387a160aac9946c28f4d193b4d7cee9e.pdf?index=trueIn PDF document text
    • http://jaxunukologefis.onlinewebshop.net/34957249344.pdfIn PDF document text
    • https://a72a44ae-2aae-4d6a-a6c4-235301d0a62e.filesusr.com/ugd/57436b_5df1329c6d5b4608995a223376955a1e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xutomoxu/australian_super_growth_fund_performance.pdfIn PDF document text
    • https://s3.amazonaws.com/betefowubevat/cracked_google_play_store_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/babuxufarizuxur/wegibesipigan.pdfIn PDF document text
    • http://pivimufe.atwebpages.com/how_did_the_pigman_wife_die.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_off0000f0e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E6 5568 bytes
SHA-256: b175e3fea786c3482673ad411ab95fe7d3a3e0f4d3e7b33322674bf96a67e734
font_01_sfnt_off000103b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103B8 11380 bytes
SHA-256: 29264e6d077ef4a00ece4fb8289918e297e0d4dd5cf376adc82ddb5604f78421
font_02_sfnt_off00012a6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A6A 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e