Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bf6b6b601570cf0…

MALICIOUS

PDF

81.4 KB Created: 2020-11-26 07:54:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: fa151f5fd60452bab815cf9d5b078c44 SHA-1: e776e7c8e60aa06eff37dd0766ff8b23d3b7d3d1 SHA-256: 6bf6b6b601570cf0cca8572cc49ade686aa03af6e4d26d8e079f4b94a7cda835
196 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. It contains a mass external PDF link farm and uses an SEO redirector, specifically `https://traffnew.ru/123?utm_term=la+casa+en+mango+street+pdf+espa%25C3%25B1ol`, to direct users to potentially harmful content. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest an attempt to exploit users through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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.
  • 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.
  • 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://traffnew.ru/123?utm_term=la+casa+en+mango+street+pdf+espa%25C3%25B1ol PDF link annotation
    • https://renalulawe.weebly.com/uploads/1/3/4/7/134735886/6c678f624692a.pdfIn PDF document text
    • https://sarutofujatazix.weebly.com/uploads/1/3/4/5/134584212/cb088ce3fcc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444622/normal_5f9e46418e1ca.pdfIn PDF document text
    • https://lirabofopexile.weebly.com/uploads/1/3/4/3/134356775/letelusi-rexuduwini-paditobizikomix.pdfIn PDF document text
    • https://xogexemufak.weebly.com/uploads/1/3/1/4/131437987/tuledonigo-semepipatagiwo.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/a222b382-35ca-469b-bba4-7cced735512f/54079091900.pdfIn PDF document text
    • https://s3.amazonaws.com/kozibowisenatu/35607719123.pdfIn PDF document text
    • https://s3.amazonaws.com/zupenafud/7138287794.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/43b5ffa6-7bbd-47d1-87cf-740b1aa2fd28/xiditopadabanenuj.pdfIn PDF document text
    • https://s3.amazonaws.com/zuses/98885896835.pdfIn PDF document text
    • https://s3.amazonaws.com/mexavofezoxi/32647907555.pdfIn PDF document text
    • https://s3.amazonaws.com/bajapovogam/50733364258.pdfIn PDF document text
    • https://s3.amazonaws.com/sasufufa/urban_outfitters_size_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/mubefula/hotmail.com_sign_in_hotmail_login.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_off0000fc25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC25 5628 bytes
SHA-256: 5ed447bdd4b35f63c07badc86f8de12eea50bc4c3e41770d9027ada12a16f4e3
font_01_sfnt_off00010ef6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EF6 12268 bytes
SHA-256: ed86c6bdd2ad5a78af30c0879698656c348711afc098a6ac0ed80d1e6909a95c

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