Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0fb957b5e7f866e…

MALICIOUS

PDF

100.6 KB Created: 2021-03-04 02:51:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: d1b47cb38f94f158675ea4779f82aa70 SHA-1: b35d9af4678bd6537a76c74f32704fb855dfa99f SHA-256: f0fb957b5e7f866ea71b1df01c50bb5d445ba0133aa233b76b8d061f5b22b8f0
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URLs, many hosted on disposable domains, suggesting a phishing or link-farming operation. The PDF structure and embedded URLs are indicative of a spearphishing attachment, designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/123?utm_term=agu+international+journal+of+research+in+social+sciences+%2526+humanities PDF link annotation
    • https://cdn.sqhk.co/burexewejam/ihnih0u/hp_smart_app_won_t_find_printer.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409102/normal_5fddfa19d8430.pdfIn PDF document text
    • http://helplnstagramcontact5087423.com/mitanuvajitevovejixufgixv6.pdfIn PDF document text
    • http://rowomonug.mywebcommunity.org/what_does_taco_bell_mild_sauce_taste_like.pdfIn PDF document text
    • http://tifusavegapawuf.mygamesonline.org/jenepomox.pdfIn PDF document text
    • http://xelamoxadavas.mywebcommunity.org/thomas_calculus_instructors_solutions_manual.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374689/normal_6021ca25edb65.pdfIn PDF document text
    • http://salizurewaki.mypressonline.com/bijeju.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481821/normal_5fe714eb09854.pdfIn PDF document text
    • https://cdn.sqhk.co/zunesunatiri/gic1VrK/runijevozovirelifuwukis.pdfIn PDF document text
    • https://cdn.sqhk.co/guzoladip/gtuFRRW/mcdonald_s_phone_number_nearest_me.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453100/normal_5ffcadc93e078.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/livivuvuwugeb/55739448582.pdfIn PDF document text
    • http://wojibikifi.myartsonline.com/22_jump_street_poetry_slam.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_off0001282f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1282F 11388 bytes
SHA-256: d3962bd1cce6c0f1b776e4ce97ad6c5d7afc2ae2d4cce72496d52a69ec3e9a1f
font_01_sfnt_off00014bf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BF2 5208 bytes
SHA-256: 6fec7e6acf2a5d2bcce5ddf52c4cf3b585afc1e6bbb86217447659d553296155
font_02_sfnt_off00015db0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15DB0 11904 bytes
SHA-256: 66d59738e1b99e75de6e2d15c506cfcd520d0c837444d5755fd69cf1d2528ba2

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