Malicious PDF — malware analysis report

Static analysis result for SHA-256 83a96278632d8299…

MALICIOUS

PDF

79.0 KB Created: 2021-05-02 06:01:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 27a1e735212becd116cb85f40df336de SHA-1: 15b918660e28f8ec2fbedee47431d8c64bcbaece SHA-256: 83a96278632d8299271c303c560b8e5e22f72f09b5394bd1f64672f4f075792b
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are to suspicious domains, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate maliciousness. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a phishing or malware distribution vector, likely initiated via spearphishing.

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://pelibifir.ru/strik?utm_term=university+of+pennsylvania+logo+png
    • http://komarovskii.xyz/sentence_construction_worksheetzujrc.pdf
    • http://lavka-karamel.ru/pathfinder_2e_core_rulebook_free_download7pmf2.pdf
    • http://lnstagram-copyright-confirms.com/how_to_clean_dyson_dc39_vacuumjl9tl.pdf
    • https://cdn.sqhk.co/bugolajoxodu/gdNTje6/49068200852.pdf
    • http://winnerslm.space/radedolesosinexoponud5p0q.pdf
    • http://help-bluebadgecenter.com/juvirupkjlif.pdf
    • https://cdn.sqhk.co/ralapogifur/XmUGevb/9452332462.pdf
    • https://jubekese.weebly.com/uploads/1/3/1/6/131606730/0732835.pdf
    • https://jonurimexiv.weebly.com/uploads/1/3/4/3/134321783/4449329.pdf
    • https://cdn.sqhk.co/poxofufiko/tajgehd/input_definition_under_gst.pdf
    • https://gagetagij.weebly.com/uploads/1/3/2/6/132695244/zivuxubewo.pdf
    • https://cdn.sqhk.co/pikikunifav/p37lFT9/catia_manual_free.pdf
    • http://all-system7.work/redofopimalorafizu7igha.pdf
    • https://cdn.sqhk.co/mivoteloxip/xgejfWa/darokawojonuveronorupegik.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/86962650-c3b5-430d-92b3-aa09fb96eb73/dd_5e_castle_ravenloft_map.pdf
    • https://uploads.strikinglycdn.com/files/37fac6be-a24f-4861-9154-dc8dedf4032a/get_to_my_icloud_account.pdf
    • https://uploads.strikinglycdn.com/files/af49b89b-eae7-4357-94b7-8a95f72abd39/satelewafejuvawabifugad.pdf
    • https://uploads.strikinglycdn.com/files/dfa27beb-225a-4264-ad22-ad7d0a05570a/kafunotoja.pdf
    • https://uploads.strikinglycdn.com/files/d145e81f-c80c-428b-b413-71b2c3445d91/96995492679.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_off0000f765.bin
28e9f905b408409753a405cdb70fa1616e4b48e8ccee700589cb2773940f8162		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF765 5220 bytes
font_01_sfnt_off0001094b.bin
308488647b3f0e16c1011de9b7f00f4fba793c0400820e0c9ad4fc3bfcaee774		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1094B 11044 bytes

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