Malicious PDF — malware analysis report

Static analysis result for SHA-256 04a6524ff01b5882…

MALICIOUS

PDF

73.7 KB Created: 2021-04-10 05:22:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 60a200e66ca4b326ed9022900bc1e089 SHA-1: 99c92e034d697ac8380298ece2fc6c2a90c2d632 SHA-256: 04a6524ff01b58823edbe54befe4bcac10b0221e99d7410d96611312e3471c17
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The document body, though heavily obfuscated, appears to be a lure related to a common technical issue ('why is my ink cartridge not working'). The presence of numerous external URIs and the ML classifier's high confidence score indicate malicious intent, likely to redirect users to malicious websites for credential harvesting or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://golowaki.ru/strik?utm_term=why+is+my+ink+cartridge+not+working PDF link annotation
    • https://kupikonawu.weebly.com/uploads/1/3/4/8/134882044/5de6580546.pdfIn PDF document text
    • https://jinuwipalo.weebly.com/uploads/1/3/5/3/135332432/lalamajaniba_zeziseluj_kibapasar_javepa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447085/normal_5fe759150c6a2.pdfIn PDF document text
    • https://vurovovi.weebly.com/uploads/1/3/4/0/134040995/9c43f6.pdfIn PDF document text
    • https://tumebadov.weebly.com/uploads/1/3/4/8/134863232/ac4013f9.pdfIn PDF document text
    • http://kujamemapevubu.mypressonline.com/o_reilly_python_books.pdfIn PDF document text
    • http://zatutajijiti.getenjoyment.net/jifixezexu.pdfIn PDF document text
    • https://niwurakoj.weebly.com/uploads/1/3/4/5/134588258/2512242.pdfIn PDF document text
    • https://xagomutub.weebly.com/uploads/1/3/4/3/134321984/fixoge.pdfIn PDF document text
    • https://bevikutemo.weebly.com/uploads/1/3/4/6/134648684/1074274.pdfIn PDF document text
    • http://fitojijumuta.22web.org/delhi_desawar_satta_aaj_ki_report.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484359/normal_5ff3f4bacbd2f.pdfIn PDF document text
    • https://funudenor.weebly.com/uploads/1/3/4/3/134319253/2433309.pdfIn PDF document text
    • http://kotudekudoges.getenjoyment.net/nsk_deep_groove_ball_bearing_catalogue.pdfIn PDF document text
    • https://sojisesoto.weebly.com/uploads/1/3/1/4/131437607/7260958.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426687/normal_60030c414e321.pdfIn PDF document text
    • https://kowasazupajobex.weebly.com/uploads/1/3/1/3/131383373/mokejetepi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408863/normal_6003d3e546e66.pdfIn PDF document text
    • https://sefusozikoju.weebly.com/uploads/1/3/4/3/134366316/e45931721.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wesatume.atwebpages.com/financial_planning_budgeting_and_forecasting_financial_intelligence_collection.pdfIn PDF document text
    • http://jidabalelibixu.rf.gd/58298388801.pdfIn PDF document text
    • http://siwuwevined.epizy.com/mike_murdock_seven_laws.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_off0000e43b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE43B 5592 bytes
SHA-256: 4d2dbb1f46db1cea25d902c485bbc686e75fdff9448559715928d771d6f4e654
font_01_sfnt_off0000f73d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF73D 10044 bytes
SHA-256: a68eba3fe9842c72aac972f773d005f57d44cbaedb6c709422fbe7089edf262d