Malicious PDF — malware analysis report

Static analysis result for SHA-256 44d996d070516a5e…

MALICIOUS

PDF

74.7 KB Created: 2021-05-19 20:52:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 7aceffe830048e506b64b158176c6711 SHA-1: 200f9da06212cff19251e88f1b7dff7a6e485376 SHA-256: 44d996d070516a5e5bd05650ef4e5f40d03a40033beb5208d11b73678bb8c86e
254 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains numerous links to external PDFs, many of which point to a redirector infrastructure. The primary redirector URL is `https://yafferge.ru/strik?utm_term=lords+mobile+codes+february+2021`, which is flagged as malicious. This suggests the document is part of a phishing campaign or a link farm designed to distribute malware. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://yafferge.ru/strik?utm_term=lords+mobile+codes+february+2021 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4408995/normal_603523a4bcc7d.pdfIn PDF document text
    • https://xoxomupufolud.weebly.com/uploads/1/3/0/9/130969418/6056666.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446944/normal_606e3176a01e7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411922/normal_60261b614a0a9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409420/normal_5ff79cdc8dba9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459027/normal_5ffd0e6d3bf8f.pdfIn PDF document text
    • https://kiwiwutirove.weebly.com/uploads/1/3/4/7/134707888/4636f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411001/normal_6016517b2a07f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502464/normal_6027bc937b1a8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465398/normal_60651dc6a145b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377928/normal_605dbf9b988a9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453129/normal_605dfaa55d496.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476282/normal_60501c304eb91.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421208/normal_5fc8537d12ef1.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/jemisajoda/30563302217.pdfIn PDF document text
    • https://s3.amazonaws.com/meludav/how_much_is_michael_jackson_worth_right_now.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_off0000e3c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3C6 5676 bytes
SHA-256: 912222c9025e52818269c56c14590ba70589c735810d95d68b7558fc9aa4a787
font_01_sfnt_off0000f70a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF70A 10812 bytes
SHA-256: 2ad87537ba020975f1d2adfe23dac305796076d1f1dd61b74f5fd9175cae29d7

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