Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb5ec11459e67214…

MALICIOUS

PDF

76.5 KB Created: 2021-03-13 18:58:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6dfc009cbb9509a3384f8582f369dd3b SHA-1: 72c432d926ad56170327de2aa9305ff18c5f64dd SHA-256: cb5ec11459e6721469bd612421f508b692760011ee5159f9b487b501746333be
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which are generated for SEO purposes, suggesting a link farm or content stuffing tactic. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic point towards the document's primary function being to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://kuzutuzo.ru/wix?keyword=vanilla+wow+first+aid+guide+1-300
    • http://health-top.ru/python_for_loop_break_continue_passe8i8e.pdf
    • http://freud.icu/25772675568fouk4.pdf
    • http://gukukoraxolu.iblogger.org/how_much_does_a_gender_reassignment_surgery_cost.pdf
    • http://blog-millionaire.buzz/temedetogizovabebfp56.pdf
    • http://sfr-espace.best/zosalop9ptl7.pdf
    • http://generalmassage.online/725930670673osns.pdf
    • http://misiliv.66ghz.com/55562573541.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://d525ee04-2a40-494f-8ba9-fee52f7b18ee.filesusr.com/ugd/8b8e24_eda0a44cfd4f4625a0ef9ce86bbda0ab.pdf?index=true
    • https://s3.amazonaws.com/wezukep/corel_draw_9_cdr_files_free.pdf
    • https://997b2cc2-d96d-4654-b184-8a5d7ad473c0.filesusr.com/ugd/b8d08c_4c3f422f43544160b3f8aef37437c613.pdf?index=true
    • https://b6d28218-96ba-4f98-b9c1-0d78b4e6fe84.filesusr.com/ugd/47aa88_7b4ea6ac50b7414e9cae010a527f03b1.pdf?index=true
    • http://tofezaniv.rf.gd/61140773006.pdf
    • https://s3.amazonaws.com/mokuwanibof/placement_report_example.pdf
    • https://s3.amazonaws.com/fowikorejodi/wurivoliregapuramu.pdf
    • http://poramukuwulaji.epizy.com/ashton_hagans_kentucky_stats.pdf
    • http://xadifoduboboriv.rf.gd/18073535975.pdf
    • https://s3.amazonaws.com/wokesabisevo/83402040522.pdf
    • https://s3.amazonaws.com/petubapizo/adobe_reader_free_full_version.pdf
    • https://s3.amazonaws.com/dazovosugev/capitulo_2a-_2_reflexive_verbs_continued_answers.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed97.bin
c92987be12c82b0afdc136ccfd5778ee91e03fdff581dbf9dc7677280851b97b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED97 5524 bytes
font_01_sfnt_off00010099.bin
3203af4a3f038bbf17854309e61e4eaac2e3038fb008eb82853cf19b28c089a7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10099 10632 bytes

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