Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9bf92a5c8f92b40…

MALICIOUS

PDF

108.5 KB Created: 2021-03-30 06:14:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6e23864d4eeaebafc1922a510893e25b SHA-1: d032195c37d84a8d1acbe616a9bb668e25fa80ac SHA-256: a9bf92a5c8f92b4072d0276ef995cb0b5f9bf818ee01a5e83ba59014cfb816cf
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, indicating a link farm or phishing lure. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external URIs point towards a phishing or malware distribution scheme, likely initiated via spearphishing.

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://nipisod.ru/award?keyword=balkan+wars+pdf
    • https://nawikavo.weebly.com/uploads/1/3/0/8/130814462/5f0d9a.pdf
    • https://cdn-cms.f-static.net/uploads/4460688/normal_602b34a208a04.pdf
    • https://zolefixu.weebly.com/uploads/1/3/4/4/134432518/5345921.pdf
    • https://gilurumujeluzem.weebly.com/uploads/1/3/1/8/131857598/362274.pdf
    • https://nabokopawupanav.weebly.com/uploads/1/3/0/7/130739772/6413720.pdf
    • https://static.s123-cdn-static.com/uploads/4371783/normal_5ffeb852d68f4.pdf
    • https://cdn-cms.f-static.net/uploads/4385424/normal_60145034b47f5.pdf
    • https://kinijanara.weebly.com/uploads/1/3/4/5/134585029/povidexukebesisa.pdf
    • https://cdn-cms.f-static.net/uploads/4457302/normal_602da6f1b3d4d.pdf
    • https://static.s123-cdn-static.com/uploads/4379960/normal_5ffc72f4eaff4.pdf
    • https://static.s123-cdn-static.com/uploads/4385862/normal_5fdff1e3ee8e3.pdf
    • https://static.s123-cdn-static.com/uploads/4367644/normal_5fff5bb8285a7.pdf
    • https://jupoxoguji.weebly.com/uploads/1/3/4/0/134097256/dubogokuxoxurorujuw.pdf
    • https://lifunakejeka.weebly.com/uploads/1/3/4/3/134358873/514d5c419d8709c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://ed21222e-fee3-4fab-8b52-e2ddb7bb35ab.filesusr.com/ugd/e73fea_a9df23c0462c471ba008a6cd3a31749b.pdf?index=true
    • https://a5a7f18c-b887-48a0-80cc-3627c14345d5.filesusr.com/ugd/609f59_91347cbc8d3a4bc897e367d12ba9c6c8.pdf?index=true
    • https://uploads.strikinglycdn.com/files/ea5f0027-7411-43b4-ab4d-434ab9e239a4/libro_de_inteligencias_multiples.pdf
    • https://uploads.strikinglycdn.com/files/2d8bd155-c43f-406b-9b65-e67b59ecd601/chamberlain_liftmaster_professional_1_3_hp_wont_open.pdf
    • https://9df6e0af-a028-4e88-91ba-61a1b37318d5.filesusr.com/ugd/7c1f05_62718aa1fa6f417d9326d248f727cfc3.pdf?index=true
    • https://4123e755-5e7e-4fb8-b167-49ba90d37259.filesusr.com/ugd/fd3290_cfc5c4aa68f54e4b8d04a926dfa79191.pdf?index=true
    • https://uploads.strikinglycdn.com/files/eb28d689-301b-45d0-a398-597158cdc9c5/cornerstones_of_cost_management_3rd_edition_solutions.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00016098.bin
15e82025806110d6590aac27bf846c17b3145010d476f7d995e713d391bb1b28		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16098 4672 bytes
font_01_sfnt_off00017082.bin
fa896588382578ec8f240521a101f500b404de05649f69558b4e13b31413f358		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17082 11460 bytes
font_02_sfnt_off00019697.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x19697 4324 bytes

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