Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e1af774758f49b2…

MALICIOUS

PDF

64.3 KB Created: 2021-04-19 14:16:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 77bfeb9f2a8180e0f5b23d9a6f137289 SHA-1: cbf10a56367bba00a42cb289473210fd78321271 SHA-256: 8e1af774758f49b2c1d03f418c63a64cb0e7f5d6ac41b5635abce40a9347fe60
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates the document is a link farm hosted on disposable domains, suggesting an attempt to redirect users to malicious sites. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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
  • 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://www.jwico.com/sites/default/files/webform/47965191786.pdf
    • https://www.mothercare.ro/sites/default/files/webform/resumes/77861868930.pdf
    • https://www.newburghgroup.com/sites/default/files/webform/resumes/mogewewe.pdf
    • https://natsihwa.org.au/sites/default/files/webform/17015803.pdf
    • https://www.termis.org/system/files/webform/dexifivoneput.pdf
    • http://seiary.com/sites/default/files/webform/rec/47545977947.pdf
    • http://klm3fg.grhosting.cz/sites/default/files/webform/files/todoxobolukajit.pdf
    • https://www.blplegal.com/sites/default/files/webform/80507347088.pdf
    • http://www.birdlifebotswana.org.bw/sites/default/files/webform/sightings-sketches/fipeforivu.pdf
    • http://pilgrimland.com/sites/default/files/webform/resume-uploads/69774832497.pdf
    • https://www.a1touchsolution.nl/sites/default/files/tarutemivejumariwara.pdf
    • http://russian-ice-spb.ru/sites/default/files/webform/files/77599308563.pdf
    • https://ambrose.edu/sites/default/files/webform/vopezupudatirarib.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=how+to+reboot+sony+xbr+tv
    • https://gradfutures.princeton.edu/system/files/webform/25860956451.pdf
    • https://ubmemeaensoprod.s3.amazonaws.com/ifsec_international/call_for_papers/2021/03/52983615418.pdf
    • https://community.princeton.edu/system/files/webform/13590028771.pdf
    • https://gradfutures.princeton.edu/system/files/webform/16157352895.pdf
    • http://www.w3.org/1999/02/22
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c5b0.bin
3ef6a85f940fb675e6ba571e16995a324baae9d52818d44ae404c40c025011f2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC5B0 4860 bytes
font_01_sfnt_off0000d65f.bin
ea2ea8d70ea878e5ef49178fd20183753cc6e88a46e44a7687b42f7848766b74		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD65F 10864 bytes

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