Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e45a171c9a2d53e…

MALICIOUS

PDF

68.2 KB Created: 2021-04-27 22:04:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 9085b11c9363e1dba1804d05ce11ca70 SHA-1: e3164ffbd782f5be43be160383e08f7286b88f79 SHA-256: 1e45a171c9a2d53e2862aa1d4aaa83e4177c0721d31bcf65dc4aefadb2e1a3e4
126 Risk Score

Malware Insights

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

The PDF file, identified as malicious by ML classifiers and ClamAV, contains numerous external URIs pointing to disposable hosting domains. The document body, though heavily obfuscated, suggests a lure related to 'alpinism training log pdf'. The presence of external links and the 'link farm' heuristic indicate an attempt to redirect users to potentially malicious websites, likely for phishing or malware distribution.

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://botokaw.ru/strik?utm_term=the+new+alpinism+training+log+pdf PDF link annotation
    • http://file-id.ru/8712645080320rnb.pdfIn PDF document text
    • http://hamsterbig.com/623719811767elv9.pdfIn PDF document text
    • http://toxipoxekej.medianewsonline.com/celestine_prophecy_tenth_insight.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383561/normal_605bb288ca2f4.pdfIn PDF document text
    • http://bogaxusamukuxid.22web.org/kabir_amritwani_song.pdfIn PDF document text
    • http://paxejunon.mygamesonline.org/islam_di_asia_selatan.pdfIn PDF document text
    • http://closemaze.com/dhoom_2_hrithik_roshan_dancel24sc.pdfIn PDF document text
    • http://koreatop.ru/how_much_does_it_cost_to_ship_200_lbs_fedexcv8pv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481155/normal_601d8342e6da4.pdfIn PDF document text
    • http://raraveluwogevuw.mypressonline.com/bittersweet_miranda_beverly_whittemore.pdfIn PDF document text
    • http://pagavopalubutu.scienceontheweb.net/nemimazowirameninajoxobe.pdfIn PDF document text
    • http://getsol.xyz/sasafufasubobusodrzi3m.pdfIn PDF document text
    • http://umkatrade.ru/taco_bell_fire_sauce_nutritionr3744.pdfIn PDF document text
    • http://logvoz.ru/93968466968e9nvf.pdfIn PDF document text
    • http://pl50off.info/61452654586ct29d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445739/normal_602d3e3275fc8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ae0ecf71-49bb-4ac4-bba4-d0f2a20d1af9.filesusr.com/ugd/668a47_be2c3d885950468e912b4f51193228b8.pdf?index=trueIn PDF document text
    • https://baad1762-ad72-434c-be9a-9de7d8068d01.filesusr.com/ugd/61395f_c212dadadb11458f99575d80ad0a10ec.pdf?index=trueIn PDF document text
    • https://a22c3535-4c29-4f26-bf6b-1e631d3648e5.filesusr.com/ugd/28986c_d1797ecc0b624c83b054900c694d6b8a.pdf?index=trueIn PDF document text
    • http://vogutuzalosomo.rf.gd/28708559556.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_off0000cd39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD39 5496 bytes
SHA-256: 0458421427c301035f7feaf8643c7f674ba433bcae4878bbd7973032675cd2cb
font_01_sfnt_off0000dfd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFD2 10332 bytes
SHA-256: a0744e48c0b0dfb2065c28fd8fa6e19e72e5fbc6b51410acfcfad3af36b34a22

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