Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5802166fca4a53e…

MALICIOUS

PDF

68.3 KB Created: 2021-03-22 20:13:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 9f0b3a78e0ebdc0da747b5272088b302 SHA-1: 5437d251e96d5a1e983c2de4057282ed324f790a SHA-256: a5802166fca4a53e5a7e8d9312ed4d9665ebd7e160e2bde819f3cbc6df6dce61
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://baarspo.ru/strik?utm_term=how+to+read+myocardial+perfusion+scan PDF link annotation
    • http://boribonabone.mypressonline.com/canon_mp250_driver_linux_ubuntu.pdfIn PDF document text
    • https://xipumizi.weebly.com/uploads/1/3/4/7/134746986/7184415.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388413/normal_5fe564d4bfeff.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369643/normal_5ff48702d4214.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446374/normal_5fdb8f8977f5f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460241/normal_60344d08ed395.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500001/normal_5feee70b867cc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370080/normal_5fd8bec55b19d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450419/normal_6044da4e98827.pdfIn PDF document text
    • http://mobutadaxez.medianewsonline.com/bergey_s_manual_of_systematic_bacteriology_volume_3_free_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465703/normal_6041a2b5dee91.pdfIn PDF document text
    • http://keniworu.mywebcommunity.org/fuvesekewutafogujaw.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484820/normal_5ff81aa1201c2.pdfIn PDF document text
    • https://sugelazo.weebly.com/uploads/1/3/4/7/134767002/tuzug.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://02bc4616-4eae-4b38-b2c9-0e654f754ee0.filesusr.com/ugd/069df5_9827e2428129422585382077c989c22b.pdf?index=trueIn PDF document text
    • https://c63ca81c-6df4-4ec3-bc2e-8508f29a6879.filesusr.com/ugd/d48fe3_269c09fd2aeb4a47b64acd7f4362a705.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/22dedf1f-034f-41c7-8d1a-c45645472edf/75144888289.pdfIn PDF document text
    • https://8cff2b46-3289-4d4c-b6d5-84761b4963bb.filesusr.com/ugd/c91274_def709c7245f4537ad85bf53b8f3bc37.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/efef6ea9-7770-4e70-b2f8-c21acaae3876/sweat_app_review.pdfIn PDF document text
    • https://a765b249-d442-4b07-8ea9-8318d996b894.filesusr.com/ugd/902d29_1d51bfd280364cb292afac57350e1df7.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ce7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE7E 5456 bytes
SHA-256: f8b0f093ac9acf004f8bd041a2e8883bc7f2a9bfbec888bc4d375a980b37a169
font_01_sfnt_off0000e10e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE10E 10488 bytes
SHA-256: f1fc8312b694a2dc516312473e8c10fafb45f5edcc552f4f341046eb2d14afd9

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