Malicious PDF — malware analysis report

Static analysis result for SHA-256 28ebb3adf97cb604…

MALICIOUS

PDF

73.2 KB Created: 2020-12-31 03:56:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3b74c4e94c4fc55eaccd7a731453d7c7 SHA-1: 6750f991df7b5ba8e561b6e25be9a308b30ea825 SHA-256: 28ebb3adf97cb6046661daac076f23cd5d9d1bb2389674fc72207838a37aed22
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a link farm, which is a common technique for SEO manipulation or directing users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the presence of numerous external links suggests the primary goal is to redirect the user to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://traffnew.ru/strik?utm_term=2007+tacoma+x+runner+specs
    • https://gokopawe.weebly.com/uploads/1/3/4/4/134493337/97878.pdf
    • https://cdn.sqhk.co/kuruwoke/hEidDsW/44884113772.pdf
    • https://tedawubav.weebly.com/uploads/1/3/4/3/134376018/8e97d289c.pdf
    • https://xadularapiro.weebly.com/uploads/1/3/1/4/131437383/7178689.pdf
    • https://static.s123-cdn-static.com/uploads/4454819/normal_5fc87b3dcefe0.pdf
    • https://xavoxoxuda.weebly.com/uploads/1/3/1/3/131379246/birevigogolezejene.pdf
    • https://cdn-cms.f-static.net/uploads/4371806/normal_5f89952702413.pdf
    • https://naweviwezufas.weebly.com/uploads/1/3/1/8/131856142/sazonude_gasufosabu_kibogoros.pdf
    • https://cdn.sqhk.co/baxemazisod/fiaDjcj/diced_onion_substitute.pdf
    • https://static.s123-cdn-static.com/uploads/4467004/normal_5fcdf73a4edfd.pdf
    • https://cdn-cms.f-static.net/uploads/4368245/normal_5fa0fc742166b.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/98001114-750c-4a7d-b96f-e0a709a67c61/fc_bayern_munich_dls_kits_2020.pdf
    • https://uploads.strikinglycdn.com/files/7574c528-67f4-42b5-a1cf-b719329582da/tinder_pick_up_lines_reddit.pdf
    • https://uploads.strikinglycdn.com/files/13a472f5-cfe5-497f-8643-d1820f718266/rallye_lecture_cm1_cm2.pdf
    • https://uploads.strikinglycdn.com/files/59936b2e-ea8a-4ac3-9615-19357a1387bb/11603121775.pdf
    • https://uploads.strikinglycdn.com/files/aa438ad5-1a29-49ab-a339-cedb6a6cd288/81776948232.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_off0000dfca.bin
752f6b59f9eeeed385517e93f0afd32373789ad0da8aa760481fbde531b4a644		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDFCA 5372 bytes
font_01_sfnt_off0000f203.bin
1cd3f6508e8ac2c22da20d7bbfc904fcc9a9bd06b3f36fa49af785edc1576fa0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF203 11044 bytes

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