Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f3f2c82bda897ae…

MALICIOUS

PDF

67.2 KB Created: 2021-02-23 12:11:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 8e5f82e8b1d54644e9803ea1eeb0f68d SHA-1: 51003333752153ec7e442713ee5012072619bf36 SHA-256: 9f3f2c82bda897ae005f133d721e18310c920204e93fea518c620395fbf582f7
214 Risk Score

Malware Insights

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

This PDF file contains numerous links to external websites, many of which are part of a link farm designed to improve search engine rankings. One critical heuristic indicates that a link points to known malicious redirector infrastructure, specifically 'https://yafferge.ru/strik?utm_term=visual+basic+dot+net+2008+free+download+full+version'. The document body, though heavily corrupted, contains text suggesting a lure related to software downloads. The presence of embedded URLs and the ML classifier's high confidence score strongly suggest a phishing or malicious redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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=visual+basic+dot+net+2008+free+download+full+version In PDF document text
    • https://cdn-cms.f-static.net/uploads/4417226/normal_5fe8f237d410b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406466/normal_5fe40a67d8801.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446492/normal_60242843d8133.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367617/normal_5fcb8f3722b57.pdfIn PDF document text
    • https://gawudizilox.weebly.com/uploads/1/3/5/3/135300959/4355171.pdfIn PDF document text
    • http://kimagibasip.22web.org/17332332518.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376874/normal_60090a4e5420d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404290/normal_5ffbad76811a3.pdfIn PDF document text
    • http://all-system7.xyz/tuluzeferonigox49mz9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470703/normal_5fe6e2281d933.pdfIn PDF document text
    • https://detofupupe.weebly.com/uploads/1/3/1/3/131384021/muwiwa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mijunuwe.epizy.com/how_much_is_sarah_j_maas_worth.pdfIn PDF document text
    • http://jatokipukaku.epizy.com/when_to_use_single_quotes_in_apa.pdfIn PDF document text
    • http://bewaxupu.rf.gd/kajoxosovimikaxagudov.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_off0000c7bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7BB 5740 bytes
SHA-256: 68287b7933f61c55306b2dc6cd681db226bb55cfae1600d6bd80dcb4c5cb1686
font_01_sfnt_off0000db6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB6C 11492 bytes
SHA-256: 1034032843dc3737de9e40ac38601200352b3a4c843c12107da9cd231c511275

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