Malicious PDF — malware analysis report

Static analysis result for SHA-256 17ed83656cd3c67c…

MALICIOUS

PDF

83.5 KB Created: 2020-11-22 06:07:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: f55799f8bf3751237b1decb6ca339d7f SHA-1: 37c427a195a7bbf5ac78bed295dad4f9eb3ee73e SHA-256: 17ed83656cd3c67c6a472011751ffde4e6dc71b04267da9dbba2f07653caa3de
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, many of which are part of a link farm designed to improve search engine rankings, a common tactic for phishing or malware distribution. The primary malicious URL identified is trafffe.ru, which is likely used to host or redirect to a malicious payload. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://trafffe.ru/123?utm_term=quadratic+application+word+problems+worksheet+answers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4419423/normal_5f9fb38497ca1.pdfIn PDF document text
    • https://lefasibemaji.weebly.com/uploads/1/3/4/5/134589759/34e2f8c81a779f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499629/normal_5fb854043374f.pdfIn PDF document text
    • https://wirufaxiferid.weebly.com/uploads/1/3/4/5/134599318/betiwu-vufiwa-xavigojora.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384046/normal_5f9fd198ccc07.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405181/normal_5fad5e3056784.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368481/normal_5f8f8f18db0fc.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/8959f7b8-99af-45cc-874b-5c6ee4bb4ecf/37159244277.pdfIn PDF document text
    • https://s3.amazonaws.com/gogonof/yoshikage_kira_cosplay.pdfIn PDF document text
    • https://s3.amazonaws.com/jozetej/zufube.pdfIn PDF document text
    • https://s3.amazonaws.com/kavitokolezub/branches_of_soil_science.pdfIn PDF document text
    • https://s3.amazonaws.com/tadovu/vijuwuxedoza.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_off00010384.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10384 5672 bytes
SHA-256: fb24a214eec6b517fafcaf1bb97f3274dd222501f3aa0e2b79e11b6e052cae8a
font_01_sfnt_off000116a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116A8 12428 bytes
SHA-256: d6ab8ed40729eb9eea031e9e9fb83c578076721c4e8561faaf6e4b31ecb8df91

Open this report in the interactive analyzer, or submit your own file for analysis.