Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf768c5f0df9d74c…

MALICIOUS

PDF

67.4 KB Created: 2020-12-22 08:39:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 3cc8ccda2dd0ea33f4f7b76d745e5df9 SHA-1: 9b156e1744ef87ad58ea4a0287a84f6425f73a6a SHA-256: cf768c5f0df9d74cbd33a82739db14ac6cdc4a9d0b8fca134eec611ea54da3d1
156 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 5

  • 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.
  • 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://trafficel.ru/strik?utm_term=halloween+bingo+game+patterns PDF link annotation
    • https://jadufebifov.weebly.com/uploads/1/3/4/6/134627690/dewiw_wemomazoko.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393904/normal_5fc1b305ade82.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374978/normal_5f9b47c399157.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385614/normal_5fb2a988237d8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454043/normal_5fc0ca3da8c14.pdfIn PDF document text
    • https://koverirenupoma.weebly.com/uploads/1/3/4/7/134747520/29056c69d45ff75.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473340/normal_5fc4fba4037c6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/dozore/hip_hop_dance_india_video.pdfIn PDF document text
    • https://s3.amazonaws.com/fizup/hungry_shark_world_hack.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e04b33eb-af83-441b-a851-3168aab50f8a/the_pedigree_below_traces_the_inheritance_of_alkaptonuria.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/23cd21eb-7a4f-4450-8d47-373e9650c075/honda_snowblower_hs622_repair_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a6b04a2-1cc9-4746-8c4e-3c2dbda6afbe/mr._mackey_mkay.pdfIn PDF document text
    • https://s3.amazonaws.com/zirojopemup/rawazevodutelaxamepi.pdfIn PDF document text
    • https://s3.amazonaws.com/kepevipawit/monega.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/02273418-62ba-4497-8987-70df44b3a817/super_fighter_unblocked.pdfIn PDF document text
    • https://s3.amazonaws.com/mamukawaxatali/gatutobaguvotisu.pdfIn 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_off0000cc67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC67 5332 bytes
SHA-256: b6cba2fe8c268763a65bd648f8125c59c8cbe7f668b0b4fd56a994b76d95ac46
font_01_sfnt_off0000de80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE80 10016 bytes
SHA-256: a562b92260921408b15a81396681b60e45f5a72cc0913cfc1308e7507ab9bf37

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