Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1f8bbe8c53c7db2…

MALICIOUS

PDF

75.8 KB Created: 2020-12-23 14:07:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eff8912b6c75cab63d7d62e6c4aa483a SHA-1: 1ff9e8a6505c053d8bf076621106cfdf318b7c24 SHA-256: b1f8bbe8c53c7db2bd98b0afa65c62d27b112838abd0d87c3be37c34efbd3a5c
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a large number of external links, many pointing to Weebly-hosted PDFs, suggesting a link farm or redirection mechanism. One of the primary external links is to 'traffine.ru', which is likely part of a phishing or malware distribution campaign. No scripts were extracted, but the PDF structure itself is indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://traffine.ru/123?utm_term=picking+winners+a+horseplayer%2527s+guide+pdf
    • https://jetizapu.weebly.com/uploads/1/3/4/3/134371104/venatorowa.pdf
    • https://rubovumalez.weebly.com/uploads/1/3/4/4/134458479/bb20a.pdf
    • https://pafetuvuwube.weebly.com/uploads/1/3/4/3/134321561/dapazisigu_risubugabub.pdf
    • https://cdn-cms.f-static.net/uploads/4428035/normal_5fd13b033e7a4.pdf
    • https://wozibasibif.weebly.com/uploads/1/3/4/8/134868806/e080746b.pdf
    • https://satufimitu.weebly.com/uploads/1/3/4/7/134715308/wisudadina.pdf
    • https://cdn-cms.f-static.net/uploads/4417413/normal_5fac13cff41d7.pdf
    • https://static.s123-cdn-static.com/uploads/4481408/normal_5fe2c225a684a.pdf
    • https://dobekaveliwe.weebly.com/uploads/1/3/4/5/134599348/milufex.pdf
    • https://xasukibumit.weebly.com/uploads/1/3/4/7/134749231/5f043e9ec2cd.pdf
    • https://cdn-cms.f-static.net/uploads/4377391/normal_5fbd061295c13.pdf
    • https://cdn-cms.f-static.net/uploads/4424330/normal_5f9b5c74265ba.pdf
    • https://cdn-cms.f-static.net/uploads/4369138/normal_5fa877f6bf2a9.pdf
    • https://cdn-cms.f-static.net/uploads/4376850/normal_5f92e90adaad4.pdf
    • https://vodipewelo.weebly.com/uploads/1/3/1/6/131637384/9150e00a6f9415.pdf
    • https://cdn-cms.f-static.net/uploads/4410722/normal_5fb0383f8b11b.pdf
    • https://cdn-cms.f-static.net/uploads/4489595/normal_5fad3c2a0b7cf.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/efceafbe-7584-4586-957d-8509879a7885/amanecer_parte_2_online_latino_pelisplus.pdf
    • https://uploads.strikinglycdn.com/files/165c4641-9212-481a-a3d6-661db4fb8760/lord_of_the_flies_dialectical_journal_chapter_2.pdf
    • https://s3.amazonaws.com/zuguvoxoki/largest_social_media_platforms_in_china.pdf
    • https://uploads.strikinglycdn.com/files/57c0440f-6faf-45da-8f93-9c0b64b25af2/50967643765.pdf
    • https://uploads.strikinglycdn.com/files/ef6cc899-3fac-48b4-b341-17182b980022/zasovotadereg.pdf
    • https://uploads.strikinglycdn.com/files/d0fafa59-b399-418a-b0e9-e57358169806/vintage_guitar_price_guide_2020.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cb15.bin
4262975626e7950483a0b0fc78556686e785304281ececf11a7cf0ee60e2a96c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCB15 4828 bytes
font_01_sfnt_off0000dbbc.bin
021a7f30b3709bfeb67fc5e6994e4a792a7b7fa153af99d1e7e523041277d948		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDBBC 5512 bytes
font_02_sfnt_off0000ee7e.bin
9dcf4d9f95103779ab0603a8c3bc312ef303eb0d29891256e0411c1341064759		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE7E 10568 bytes
font_03_sfnt_off00011267.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11267 4324 bytes

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