Malicious PDF — malware analysis report

Static analysis result for SHA-256 1686baa570599501…

MALICIOUS

PDF

78.3 KB Created: 2021-03-14 15:06:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: beab044837696232117f43316fe11efe SHA-1: 45a92efe3c1064dfd7bed3703cb1bd8eefa8be2a SHA-256: 1686baa570599501af6ee3ed7c3669ae54586308b114d9d3c5c187230aaa37cb
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, identified as a link farm, and a primary URL pointing to a suspicious domain. ClamAV and ML classifiers also flagged this file as malicious phishing content. The embedded content, though heavily obfuscated, suggests an attempt to redirect the user to malicious sites for further exploitation.

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://xezojetit.ru/strik?utm_term=how+to+pray+the+angelus+in+igbo
    • https://cdn-cms.f-static.net/uploads/4456666/normal_603c880b45460.pdf
    • http://vidclips.design/33126345376yz6dq.pdf
    • https://cdn-cms.f-static.net/uploads/4403936/normal_601b21ada0560.pdf
    • https://static.s123-cdn-static.com/uploads/4448346/normal_5ff58db8518d6.pdf
    • https://cdn-cms.f-static.net/uploads/4390642/normal_601aff26daa15.pdf
    • https://static.s123-cdn-static.com/uploads/4470387/normal_5feb469a86b4a.pdf
    • https://cdn-cms.f-static.net/uploads/4490370/normal_5fd3d23129d20.pdf
    • http://zoompol.xyz/51162060323u5hxe.pdf
    • http://optalpha.com/86705382712at4on.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/6df21512-48f4-4e61-90ea-04fa77838d25/xewizeputobisufadudupas.pdf
    • https://711920be-b761-4f0e-a604-762b26663b16.filesusr.com/ugd/ffcbea_0e5058c8f3434e44b328eae476dce1a5.pdf?index=true
    • https://uploads.strikinglycdn.com/files/11741573-c003-4e42-b25d-3ac41ad9838b/xareziwopasofizovit.pdf
    • https://1cf095b7-1d29-4152-b82c-7733cf7ba0c7.filesusr.com/ugd/c1de29_3d7211668c6840089c63b3dfbf170a39.pdf?index=true
    • https://uploads.strikinglycdn.com/files/08acb3b4-fc3e-4448-bb85-0a92637bdd72/fatexuz.pdf
    • https://d4508431-0eee-4913-ac2a-2ec907ed9b18.filesusr.com/ugd/12daa7_2ade900299fd4613ab32c795dda04c87.pdf?index=true
    • https://uploads.strikinglycdn.com/files/b71993f3-2359-4fbc-893f-29732b81f667/rajixalulirumobeweviwuw.pdf
    • https://uploads.strikinglycdn.com/files/746c70b6-10bd-47c2-b164-a66d26d97bb6/digital_communications_specialist_job_role.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_off0000f248.bin
5d103e0d7530590d2815c721b2ca30069774f85bac7c86e6666eb6600b85f19e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF248 5376 bytes
font_01_sfnt_off0001049d.bin
01a38bd4320b1dd5d540d4c2e63edef0d6ba88eaa9c7d2804c4f41e872439ef5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1049D 13092 bytes

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