Malicious PDF — malware analysis report

Static analysis result for SHA-256 3010f8d885607abd…

MALICIOUS

PDF

78.2 KB Created: 2020-12-26 02:01:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: d49631bd372b680c494029b64d136168 SHA-1: 3a9f1a0ddf6ba3e1d0295e01d499eb11eb5668f0 SHA-256: 3010f8d885607abd3520668db169b355a7ceced5a86928f39a25a11c2707c5b5
254 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating malicious redirector links and a link farm, suggesting it's part of a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly support its malicious nature. The embedded URLs point to redirectors that likely lead to further malicious content or phishing pages.

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://cctraff.ru/strik?utm_term=iphone+11+pro+max+wallpaper+hd+4k+black In PDF document text
    • https://jatuvukaxakepu.weebly.com/uploads/1/3/4/3/134313635/ragaburafitud.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424645/normal_5fc726ce2e01d.pdfIn PDF document text
    • https://cdn.sqhk.co/godivago/cjcghEm/19279071931.pdfIn PDF document text
    • https://wefapewirevuvik.weebly.com/uploads/1/3/4/6/134667644/jobitezeboxutevik.pdfIn PDF document text
    • https://tovozilulu.weebly.com/uploads/1/3/0/8/130873983/6a6e67245.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381964/normal_5f9d5547ada39.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463306/normal_5fae42e952283.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387230/normal_5fb39abf75777.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/fixararololu/61011850696.pdfIn PDF document text
    • https://s3.amazonaws.com/tadovu/masukivolaja.pdfIn PDF document text
    • https://s3.amazonaws.com/vobuturinivi/sinod.pdfIn PDF document text
    • https://s3.amazonaws.com/jowutoneranemuk/2820156373.pdfIn PDF document text
    • https://s3.amazonaws.com/davolazupivowi/penn_high_school_marching_band.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_off0000f1fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1FB 5576 bytes
SHA-256: 8ce5043956f6cf50eb8759bee52cac6eb86a8ed7b92ed529249289d93db1e439
font_01_sfnt_off000104de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104DE 11392 bytes
SHA-256: b46d1b81f7a9fb6c270be229c1e13b52e515c4ca055f33c3a2d3a3f1ed1bbc36