Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ad55b85e85736ca…

MALICIOUS

PDF

70.1 KB Created: 2021-04-20 04:05:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5d797a095c7606984321cc5769e990a4 SHA-1: 32daa4d1d36c66d68bb3fe19d12a701dbc79bc42 SHA-256: 9ad55b85e85736ca150a7ef53e5c956e923606d8030d472f969a1bb1f195e9e1
124 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous embedded URLs, with one heuristic identifying it as a link farm on disposable hosting. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8531

Heuristics 4

  • 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 http://pilgrimland.com/sites/default/files/webform/resume-uploads/64296936159.pdf
    • https://www.uts.cw/sites/default/files/webform/nufideleze.pdf
    • https://www.jwico.com/sites/default/files/webform/koxajupenukolipidawikopi.pdf
    • http://oaklandchildcare.org/sites/default/files/webform/41266633523.pdf
    • https://www.ofalloncasting.com/sites/default/files/webform/66890294103.pdf
    • https://www.dgs-interparts.be/sites/default/files/41094691834.pdf
    • https://www.natsihwa.org.au/sites/default/files/webform/25680057182.pdf
    • http://russian-ice-spb.ru/sites/default/files/webform/files/40307308503.pdf
    • https://www.jsif.org/sites/default/files/webform/95147346690.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=rainsoft+water+softener+installation+diagram
    • https://www.ice.cam.ac.uk/sites/www.ice.cam.ac.uk/files/webform/8342566550.pdf
    • https://ubmemeaensoprod.s3.amazonaws.com/ifsec_international/call_for_papers/2021/03/wutiladerotegedubel.pdf
    • https://ubmemeaensoprod.s3.amazonaws.com/ifsec_international/call_for_papers/2021/03/86402477901.pdf
    • https://drones.princeton.edu/system/files/webform/xakunowegetudirojevogejiw.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e7ba.bin
b6e0ce842d832f3dfb78bcb1f47b633fbb4339dca2dd1b9c422d8bfcb331256b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE7BA 5324 bytes
font_01_sfnt_off0000f9da.bin
f9cda304d7ecb961d56959f4d42a20b7bb9d1510f67d30d9f68b18a9bf9ca433		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF9DA 11512 bytes

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