Malicious PDF — malware analysis report

Static analysis result for SHA-256 f508affff70a137a…

MALICIOUS

PDF

78.1 KB Created: 2021-01-08 14:46:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 8d6c0d89ae9a4a113fe186bc5f1250f0 SHA-1: 9a4f0e97e64020ddfa36232aa0d8db32cb987a8b SHA-256: f508affff70a137afbbffc8d911c41f16d331a4b6e7d0e58ef9f6df10a835a90
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to PDF files, indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and numerous external URLs suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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/aws?utm_term=consul+template+environment+variables PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4477655/normal_5fd1c07841c0b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369142/normal_5f93deb3c869d.pdfIn PDF document text
    • https://mufiwejugoj.weebly.com/uploads/1/3/4/3/134340856/b8ff0895b94c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426955/normal_5fbb247b23223.pdfIn PDF document text
    • https://wosefekolejareb.weebly.com/uploads/1/3/4/3/134340916/bolovogusofuzi.pdfIn PDF document text
    • https://cdn.sqhk.co/nalawanuxa/d8xgfhf/merge_gun_shoot_zombies.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402940/normal_5fcea59ae96c9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381101/normal_5f9dbafd1d07b.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/jixerubowi/residents_guide_to_ambulatory_care.pdfIn PDF document text
    • https://s3.amazonaws.com/wemazun/rasepu.pdfIn PDF document text
    • https://s3.amazonaws.com/sefiwegegagu/96407301963.pdfIn PDF document text
    • https://s3.amazonaws.com/bodajaku/simultaneous_earthquake_drill_narrative_report.pdfIn PDF document text
    • https://s3.amazonaws.com/netinuwa/rome_2_total_war_campaign_strategy_guide.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
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dabb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDABB 5068 bytes
SHA-256: 69a2dfaef8eaad3c1bcdabe043400a751a00c5868a9153851f327b12fb647fa8
font_01_sfnt_off0000ebd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBD4 3720 bytes
SHA-256: d0c9e33916e9e64e42e31bcf0d345f6c2fcd41735b1a34df0119bd0eb1094281
font_02_sfnt_off0000f730.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF730 2236 bytes
SHA-256: a5cb4918489952136b44c1aa6dd11d6d1859577cf30f416ccad1b66782247f89
font_03_sfnt_off0001014a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1014A 12112 bytes
SHA-256: 97c40aeb495e0f8a56d054b8e91965605a8116277fa4b56ebe923afb0fe97763

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