Malicious PDF — malware analysis report

Static analysis result for SHA-256 860c9b7dda8c0277…

MALICIOUS

PDF

75.8 KB Created: 2021-05-10 05:43:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 1853ac366cd05bcc800bd15749a46894 SHA-1: 7c55b1c572aff6a3e000c3dd37b2e2a6184506de SHA-256: 860c9b7dda8c0277f0ef1bb2b51a54a56a9ecff7935a26da6e0ea9bf92ac5789
126 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan-like behavior. It contains numerous external URIs, many pointing to disposable domains, suggesting it functions as a link farm. The document body, though heavily obfuscated, appears to be a lure related to public health careers, designed to trick users into clicking on the embedded malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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=what+jobs+can+you+get+with+a+degree+in+public+health PDF link annotation
    • http://nadahul.ru/good_interview_questions_for_retail_managery432z.pdfIn PDF document text
    • http://tublitalia.space/gw2_what_to_do_with_unidentified_gearqf36l.pdfIn PDF document text
    • http://tevutubiwij.getenjoyment.net/punusopenejomaruvufu.pdfIn PDF document text
    • http://help-bluebadgecustomer.com/elite_pluralism_theory0nb80.pdfIn PDF document text
    • http://begemotiks.fun/zutifila6k9tl.pdfIn PDF document text
    • http://tiwilofojifig.sportsontheweb.net/blood_group_a_positive_diet.pdfIn PDF document text
    • http://italia-doc.fun/data_analysis_using_stata_download1v4jl.pdfIn PDF document text
    • http://felidefewipikig.22web.org/android_java_model_class.pdfIn PDF document text
    • http://tonagruz.ru/extreme_ownership_how_u.s._navy_seals_lead_and_win_2015jyxg0.pdfIn PDF document text
    • http://keepsufi.space/69091441058wps2q.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://97a45c9e-1ab5-462a-bfe2-fded34b9a8b9.filesusr.com/ugd/b50c55_13ec70eed2d2499d9ee315aa8cb69c8d.pdf?index=trueIn PDF document text
    • http://memaxoto.rf.gd/kepilila.pdfIn PDF document text
    • https://78f121e6-5824-477f-9480-4bf23eba804c.filesusr.com/ugd/9564ad_eb49c10da9564b76aae761c2020ef694.pdf?index=trueIn PDF document text
    • http://tuguwobafadurot.rf.gd/71984889962.pdfIn PDF document text
    • http://ninalosuza.rf.gd/33949501294.pdfIn PDF document text
    • https://45ed8376-e832-497f-ab20-0a31924dc5db.filesusr.com/ugd/4b7290_710bae7a4d694ca78efb8fb57c881491.pdf?index=trueIn PDF document text
    • https://627f215e-41ba-4aa4-9906-5f9f9d117739.filesusr.com/ugd/8ab72e_72b19ae15dd14a15ae227211fd21e41f.pdf?index=trueIn 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_off0000e8c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8C5 5756 bytes
SHA-256: 7f2e031feac3ecc07b71b09661fa18ee7d1cf78acd81d742ef32410ec559c7f7
font_01_sfnt_off0000fc76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC76 10956 bytes
SHA-256: 12f58e780d2b33ad608bfac2cc1d99101906733956646711e136f07a73eb8b2f

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