Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e77133f4761d932…

MALICIOUS

PDF

85.6 KB Created: 2021-01-17 14:32:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 35fccc951bff59ee34ccd940b567f4ea SHA-1: 6c3a8afbc325cc7a175c8631b20bf2cdcf1271ce SHA-256: 1e77133f4761d932876c8d0ad00bc78a711700810197f3c0a47030b5212daa45
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains a link farm with numerous external URLs, including one pointing to 'traffset.ru', suggesting an attempt to redirect users to malicious content. The document's structure and embedded links are consistent with SEO poisoning tactics to attract unsuspecting users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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.
  • 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
  • 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://traffset.ru/aws?utm_term=fundamental+of+public+administration+pdf+in+nepali PDF link annotation
    • https://site-1177315.mozfiles.com/files/1177315/65642860096.pdfIn PDF document text
    • https://site-1217012.mozfiles.com/files/1217012/zejujiruduzozodi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418000/normal_5fa2714fc315c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407724/normal_6003ce72c3721.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404964/normal_5fec473794ca0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451025/normal_5fb424940d367.pdfIn PDF document text
    • https://site-1168244.mozfiles.com/files/1168244/lotewuxuvipegonavatasigo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366321/normal_5f87510d15ed5.pdfIn PDF document text
    • https://site-1166687.mozfiles.com/files/1166687/18177974943.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393635/normal_5fd1f02ac9c30.pdfIn PDF document text
    • https://semopadilined.weebly.com/uploads/1/3/4/6/134696525/zowewolepe.pdfIn PDF document text
    • https://gabodubelekopo.weebly.com/uploads/1/3/4/3/134356924/133432.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://s3.amazonaws.com/novifamigot/91660319684.pdfIn PDF document text
    • https://s3.amazonaws.com/vonuxagupeduze/linen_sheets_sale_nz.pdfIn PDF document text
    • https://s3.amazonaws.com/dinilederu/pebex.pdfIn PDF document text
    • https://s3.amazonaws.com/genedonapubefe/pewudoribukiz.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
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e800.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE800 5396 bytes
SHA-256: 0a6e2e0b66a1d5e9575a1aea7eb550437d8b1ec2a74015154269297208e55254
font_01_sfnt_off0000fa3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA3C 3720 bytes
SHA-256: d5ecec3e822993868ba70e247019bcdb656a9fee58d620eb93bc70658e929280
font_02_sfnt_off0001059f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1059F 10788 bytes
SHA-256: 0555f3f9872fe8ae731cad9e5b443c6037a2c4d08e8b4da778e3557d68ba2a77
font_03_sfnt_off000129e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129E1 9248 bytes
SHA-256: 4841acfb8e69d9e36499f1238eb15792097aae458ed7847556a6a290ae0e4dcd

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