Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb23a817e900fb24…

MALICIOUS

PDF

77.4 KB Created: 2021-03-15 11:45:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: bb3decb67b34acb06996513576ed4d6d SHA-1: 714d28f034b6df1e68cd64e89cf72eda05256335 SHA-256: fb23a817e900fb241da1d5d57c12c244ec1f27c8b876639dd2aaa5f1cf64ddea
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. ClamAV detected this as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The embedded URLs suggest a potential phishing or malware distribution vector, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 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://bologen.ru/strik?utm_term=samsung+ht-j4100+review PDF link annotation
    • https://fubediko.weebly.com/uploads/1/3/1/0/131070718/kamubulunoj.pdfIn PDF document text
    • http://pixujuxe.mypressonline.com/breaking_off_the_engagement._bring_it_on.pdfIn PDF document text
    • https://pexaxodosusa.weebly.com/uploads/1/3/0/8/130874045/fopik.pdfIn PDF document text
    • https://vubupegizisave.weebly.com/uploads/1/3/5/3/135315261/wakoramimudu_vurixopapigukew_xinag.pdfIn PDF document text
    • https://gilaxaled.weebly.com/uploads/1/3/1/4/131438091/bigokubakib-radowagerezex.pdfIn PDF document text
    • https://nibapexi.weebly.com/uploads/1/3/0/9/130969889/xikasorex-wuxes-judogugi-buwimukig.pdfIn PDF document text
    • https://fosegeluka.weebly.com/uploads/1/3/4/7/134717840/negadaruguf-safet-fozav-reroreme.pdfIn PDF document text
    • http://kikifikoxije.mypressonline.com/taponute.pdfIn PDF document text
    • http://kefijor.mygamesonline.org/sole_elliptical_e25_vs_e95.pdfIn PDF document text
    • http://pejelurim.getenjoyment.net/what_is_a_corporate_identity_means.pdfIn PDF document text
    • https://radoxawema.weebly.com/uploads/1/3/0/7/130738714/6271422.pdfIn PDF document text
    • http://zoluwofemofuper.sportsontheweb.net/29092010255.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://e5baaea7-7007-41de-9367-4ebf3ed55875.filesusr.com/ugd/8e1900_396cd37e05424f0cbb306eb5dc02d81f.pdf?index=trueIn PDF document text
    • http://gapoxuvopa.onlinewebshop.net/what_are_the_5_dynamics_of_dance.pdfIn PDF document text
    • https://562c2315-396f-49d1-9e45-1236e049cb13.filesusr.com/ugd/ec0012_30b1929943c64422ac1a9d9925c32246.pdf?index=trueIn PDF document text
    • https://9e1b5e4e-b4ab-405b-8fdf-b3b6d7b19c28.filesusr.com/ugd/94ea38_25531268fb0b4ab4ac680d885c618edd.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xefezesebusu/wofodokoketel.pdfIn PDF document text
    • https://s3.amazonaws.com/pegozegi/lusuvejapumotalejaxi.pdfIn PDF document text
    • https://s3.amazonaws.com/minaxigevani/tuhan_agama_hindu.pdfIn PDF document text
    • https://02796127-04ec-4c85-b270-c6f7310ebb18.filesusr.com/ugd/ce0e6d_bcd83ff3bd8a4a0ea7a94bd994a0ac03.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_off0000f00d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF00D 5712 bytes
SHA-256: 79a71045ca458ecd4a7a77b4cbab8e5846029e2011d86c23d05fbdec9bf48a9d
font_01_sfnt_off0001037a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1037A 10872 bytes
SHA-256: c3b14dade9945e0082f07b6734352813f893acd4636d2983fe7893ca53b8d4e8

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