Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc9ce7616de1d948…

MALICIOUS

PDF

73.6 KB Created: 2021-05-14 13:29:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 0d7ff13bac3e148387c9a2ec2a4790c9 SHA-1: b1f99d184d83f93b118d336d5a8f688cf1a94913 SHA-256: cc9ce7616de1d948bb1f532f8cbc9f154e328497a05e2de445e423439e738c3d
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 0.9999

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://xajibur.ru/strik?utm_term=what+are+the+starbucks+coffee+sizes PDF link annotation
    • https://sorawujij.weebly.com/uploads/1/3/4/6/134671526/ginubajemusezi.pdfIn PDF document text
    • https://cdn.sqhk.co/wewotiwalote/U7idifR/77363401050.pdfIn PDF document text
    • https://xifupanudolegu.weebly.com/uploads/1/3/1/1/131164204/tugajopomejuser_tokuruzava.pdfIn PDF document text
    • https://dotofufodil.weebly.com/uploads/1/3/5/3/135313806/kumise.pdfIn PDF document text
    • https://cdn.sqhk.co/muvotugi/hf3Tgid/gevagoni.pdfIn PDF document text
    • http://autokenn.com/josumedi9xnqo.pdfIn PDF document text
    • http://onlinetiser.website/889609438444ffek.pdfIn PDF document text
    • http://ritual-venki.online/standard_costing_cima04lol.pdfIn PDF document text
    • http://cetop.xyz/a_writers_reference_freer3c13.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba52a8af-5f75-4c67-8565-998837826cdc/46555878860.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0b39cca-e57e-4675-82b6-174539304221/jafusasoxerujiriboz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/173790c5-c7d2-4983-92e2-1c31c8b11c4b/parts_of_speech_chart_montessori.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d4eb2ad9-3af6-4518-a3a7-6af0755e6bce/7841445775.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ee2aa1e-0d1f-4ba1-a35c-3a70b5dd2235/naked.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/75b6b1be-465c-430a-80f3-b6686bf683e1/16209597741.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b892915-0c47-4cd4-89fa-89f8872cdfed/best_nesco_pressure_cooker_recipes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d0fe322-0a39-4adb-927d-ca548fc09782/what_size_chain_does_a_stihl_ms170_use.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_off0000e045.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE045 5204 bytes
SHA-256: 5805c4a2b43ed10cee0e999cc3ff3056ad4aa2b9fc99fb3e49aedb4ed200865b
font_01_sfnt_off0000f20e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF20E 11136 bytes
SHA-256: 48bd208e3f44bef8183d70ea964a0e348791fb648a1ad8a8fc72ca16b8ec1953

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