Malicious PDF — malware analysis report

Static analysis result for SHA-256 092f1dd3cd6aa7e9…

MALICIOUS

PDF

81.3 KB Created: 2021-03-19 18:34:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0c42f7bfcbc97fc531c97c0da62a511e SHA-1: 1907908b1eb9e6f85a1164a351e20104acd6a940 SHA-256: 092f1dd3cd6aa7e9f2f929b6c801c3aa5ebefb31db1a789708362463ba89f956
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, indicative of a link farm or phishing attempt, with the primary URL being 'https://pelibifir.ru/award?keyword=ars+poetica+full+text+pdf'. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external PDF links, suggesting a coordinated effort to direct users to malicious content. Although no scripts were explicitly extracted, the presence of external links and the ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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/award?keyword=ars+poetica+full+text+pdf
    • https://nawexolaka.weebly.com/uploads/1/3/4/7/134704757/aa07bb1c66b.pdf
    • https://cdn.sqhk.co/kivipemo/hhjdhid/43068504625.pdf
    • https://cdn.sqhk.co/javeduner/srMijgd/gesinabedekenuzotori.pdf
    • https://cdn.sqhk.co/bapisolel/bihjbij/island_in_the_sun_clearwater.pdf
    • https://cdn.sqhk.co/xivovido/Hjfgdig/58320636534.pdf
    • https://cdn.sqhk.co/lidupusumoj/igsmdje/46072175826.pdf
    • https://lokawinopigu.weebly.com/uploads/1/3/2/7/132712062/3587953.pdf
    • https://xevekefipozi.weebly.com/uploads/1/3/1/4/131406281/7244f97b53caac.pdf
    • https://cdn.sqhk.co/kulamogo/hggjwhI/online_master_s_programs_marketing_analytics.pdf
    • https://kajubogoxin.weebly.com/uploads/1/3/0/9/130969430/kavizigub.pdf
    • https://cdn.sqhk.co/bisidilit/fbijjdc/speedy_heron_road.pdf
    • https://cdn.sqhk.co/wufevinek/D2hjhek/50658360188.pdf
    • https://cdn.sqhk.co/bemememu/hhdhf6M/25937286622.pdf
    • https://cdn.sqhk.co/nabotogemobe/3jdXSdc/34292174907.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://b0c090b1-cb02-46d8-8a69-3fb9d82636b6.filesusr.com/ugd/4dbf3f_ac5cc81d4ffd4391bb29f41b6fef7b3b.pdf?index=true
    • https://uploads.strikinglycdn.com/files/3ba4c667-bfda-4ec1-8f6f-7cbb1be52f04/what_is_beautiful_girl_in_mexican.pdf
    • https://uploads.strikinglycdn.com/files/6cd62c16-c6d6-4866-b3d9-5542b15ab0bc/95111083426.pdf
    • https://1f571a09-6495-4108-bd1a-9715deae29b5.filesusr.com/ugd/b0bf26_a03307a610594508bbc543af33caa1ab.pdf?index=true
    • https://uploads.strikinglycdn.com/files/59984ae9-d995-4f20-a048-23b9d4d60bfc/prefix_suffix_root_word_medical_terminology.pdf
    • https://d86ad34a-7df2-4f47-937b-a12ab5abc0fa.filesusr.com/ugd/8cbfce_d110908596074f2daca49b3164b62f47.pdf?index=true
    • https://uploads.strikinglycdn.com/files/34da632d-1887-4bdf-9c17-a88091b2b919/tree_of_life_bible_version_large_print.pdf
    • https://8d94caac-80d5-4f6d-a73a-04ed47837dc1.filesusr.com/ugd/585b1d_bc024582a3d34607afeb65f9d76dc203.pdf?index=true
    • 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_off00010323.bin
9dc8d954cc4e9820195165752487ece3818c159434dea219f642426d05bbb68e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10323 5204 bytes
font_01_sfnt_off000114ed.bin
761c5d89e7e7af8a9269538385aceecc7876625d6f2707237ece2ba00dbaf6ed		 pdf-font-stream PDF embedded font (sfnt) at offset 0x114ED 10368 bytes

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