Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf3e9c337a0681b3…

MALICIOUS

PDF

87.9 KB Created: 2021-03-29 21:03:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: e2870050285a4c6eaa0b3d37924e4a07 SHA-1: fb7c851db7f75004fed108728a7cc3e2fe25bd7a SHA-256: cf3e9c337a0681b3025d2a086a0c63f09c1ed4e9f651e815b91b43ab06495337
186 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 threat. It contains numerous external links, many pointing to disposable hosting, suggesting a link farm designed to redirect users to potentially harmful sites. The primary malicious URL identified is https://pelibifir.ru/award?keyword=benjamin+franklin+an+american+life+by+walter+isaacson+pdf, which is likely part of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pelibifir.ru/award?keyword=benjamin+franklin+an+american+life+by+walter+isaacson+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4469638/normal_5ff87c9c90edf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421944/normal_600354c6a09b4.pdfIn PDF document text
    • http://sdfafq.info/how_to_set_up_verizon_jetpack_on_computerq6sgt.pdfIn PDF document text
    • http://ctyr.ru/43500394717heqvy.pdfIn PDF document text
    • http://sandiego-podcasts.com/gewusisupofj3ix2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472204/normal_601bdd3262b08.pdfIn PDF document text
    • http://birapemotafew.mygamesonline.org/74057479918.pdfIn PDF document text
    • http://comp-arenda.site/cocina_al_minuto_nitza_villapolaw0rn.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://da99f664-88c7-4a27-98aa-0bbcec2e8f57.filesusr.com/ugd/66f3f9_bdc62c05d24941bfae52af74e9d339c0.pdf?index=trueIn PDF document text
    • https://c5b3e1fc-3b55-407d-a8d9-2bfa6c9015c1.filesusr.com/ugd/6df244_8c9ce72776724ceab6a75f9b5f6aee70.pdf?index=trueIn PDF document text
    • https://46fb9a51-9e16-4ad8-811e-2f7ed01702f7.filesusr.com/ugd/53363c_1d6fe278f96c48029c3050bdeb571b57.pdf?index=trueIn PDF document text
    • https://7162f0c1-3bb2-4775-9ad2-1e34613fb889.filesusr.com/ugd/595093_2d9d208df3a244c49348c083f73fcd03.pdf?index=trueIn PDF document text
    • https://7b9449e5-51e9-4a7e-81f5-8587c42320f9.filesusr.com/ugd/571bad_db192b671a6740ef8558df340a8f1e5d.pdf?index=trueIn PDF document text
    • https://729282ec-1290-4cbc-9302-cf8a24acd4c7.filesusr.com/ugd/42c189_ace88266fba045358d3edc4b389ebd5b.pdf?index=trueIn PDF document text
    • https://d4f4546a-a836-4b3d-8651-c56b89608eca.filesusr.com/ugd/3e9e83_7118d6326c03406ebd3b15119a772bc4.pdf?index=trueIn PDF document text
    • http://sajulugebimisu.myartsonline.com/46749030157.pdfIn PDF document text
    • https://56076a71-1b70-41e8-afe1-d547c394b4ee.filesusr.com/ugd/ab0d05_6f27f3a98acc446f9c61bae7856b5f7c.pdf?index=trueIn PDF document text
    • https://7afd96e6-4611-46d4-9b98-d111b897c281.filesusr.com/ugd/154221_0237530f9b84407687d0929b99f0d812.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_off00011947.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11947 5824 bytes
SHA-256: ae0972ea7eaf9a7e9d162e3543728d459b5e3ea80e5eeba777e422d0227d1f13
font_01_sfnt_off00012d21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D21 10656 bytes
SHA-256: 5b0086db6de6cff7be80fbea31c20f6ecac32e1d5b06362398a470cfac18022b