Malicious PDF — malware analysis report

Static analysis result for SHA-256 71a67571c88207a5…

MALICIOUS

PDF

63.8 KB Created: 2020-11-27 10:51:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6b1537a7014af2b8103b3980e025da62 SHA-1: 133fbc5ed5d63a78a47e3d0cc0419f774665682f SHA-256: 71a67571c88207a5f99c5bc0ccdc654af6e9398dd797be9fdfc1c8235f262462
156 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or malicious intent. It contains numerous external links, including one to 'trafficel.ru', suggesting a link farm or redirection mechanism. The document body, though heavily obfuscated, appears to be related to educational content, likely a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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://trafficel.ru/aws?utm_term=percentage+decimal+fraction+conversion+worksheet
    • https://luvikexixof.weebly.com/uploads/1/3/4/4/134481561/3979764.pdf
    • https://lexixebi.weebly.com/uploads/1/3/4/6/134670289/rudujekigetufufode.pdf
    • https://fegunase.weebly.com/uploads/1/3/4/6/134603704/8cf64f0c6d3.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/bedb6ade-5d26-4c9e-ae52-3a205c0f2d1e/bimoni.pdf
    • https://s3.amazonaws.com/fovezewi/23516429778.pdf
    • https://s3.amazonaws.com/zerejibixupav/compound_interest_worksheet_excel.pdf
    • https://s3.amazonaws.com/gupuso/amazing_things_on_amazon_under_5.pdf
    • https://uploads.strikinglycdn.com/files/e3d74dc3-c0ba-4b1c-bb90-5adde9b0ebb9/40715287477.pdf
    • https://s3.amazonaws.com/nilititonawafim/64936857871.pdf
    • https://s3.amazonaws.com/wegugus/18705590600.pdf
    • https://uploads.strikinglycdn.com/files/85eda0a1-78c9-4bcb-88f1-057561b8e626/90553300192.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bc38.bin
d076cf55ff5da2b67b26ed691d37d23410fde762f626fed32e3c0b8b27ea92c3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBC38 5652 bytes
font_01_sfnt_off0000cf60.bin
70ea0ea36f7d51de59e1da1a45b1052fe0afc4873d61fd03f2667398e99cbfe1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCF60 10324 bytes

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