Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1e5ba6fdf352b8c…

MALICIOUS

PDF

54.6 KB Created: 2020-12-11 07:17:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7774e6d3c8d4495fdf10587b09741dce SHA-1: 603ef63f7063731471679932303fe290de2ca856 SHA-256: f1e5ba6fdf352b8c81161bdb269c1526a2dadeb5f9666f73e444c6b7ac5b1c90
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of external links, many pointing to disposable domains, indicative of a link farm or phishing campaign. The ClamAV detection and ML classifier strongly suggest malicious intent. The document body appears to be obfuscated or corrupted, but the presence of numerous external URIs, including one with a UTM term suggesting a report, points towards an attempt to direct users to potentially malicious or SEO-manipulated content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8816

Heuristics 5

  • 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.
  • 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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://trafftec.ru/aws?utm_term=paper+chromatography+lab+report+amino+acids
    • https://safusubugem.weebly.com/uploads/1/3/4/6/134609944/9938238.pdf
    • https://fitetavixanara.weebly.com/uploads/1/3/4/7/134721375/muxekadaxuni-fidisogatipebu.pdf
    • https://xoretesani.weebly.com/uploads/1/3/4/3/134315313/a075e30f3536c8.pdf
    • https://nogusevufofe.weebly.com/uploads/1/3/4/5/134525370/lodon-maloturiwajer.pdf
    • https://rajexomogalifi.weebly.com/uploads/1/3/4/8/134891851/4788843.pdf
    • https://wefamojugibe.weebly.com/uploads/1/3/1/1/131164519/6875928.pdf
    • https://tivurenufetoza.weebly.com/uploads/1/3/4/2/134235987/fefibuxuvosagokufem.pdf
    • https://xojerajap.weebly.com/uploads/1/3/1/3/131384359/1392291.pdf
    • https://losepubi.weebly.com/uploads/1/3/4/5/134502138/6467c8226ce.pdf
    • https://jezaxegare.weebly.com/uploads/1/3/1/3/131380636/cbc5c3f7.pdf
    • https://static1.squarespace.com/static/5fc1651bc89e1c4b8fc1e357/t/5fc305773570fb44d16710eb/1606616439707/passion_and_purity_elisabeth_elliot.pdf
    • https://static1.squarespace.com/static/5fc79b14a4492a057e2477e3/t/5fc82a1c90a4f8549d6d9fa4/1606953501492/sivinor.pdf
    • https://s3.amazonaws.com/tunenijexe/unit_2_matter_and_energy_study_guide.pdf

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