Malicious PDF — malware analysis report

Static analysis result for SHA-256 705e82d40e2161fd…

MALICIOUS

PDF

70.1 KB Created: 2021-04-12 04:45:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 316bd8d045c8213cd4b916db14d78ce7 SHA-1: 5cafbcb1ab63aaace9033c1e10143f6617ff5163 SHA-256: 705e82d40e2161fd89123e08f02e709dc777d69eb8245561b39ccfa0b2045784
126 Risk Score

Malware Insights

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

The file was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to disposable domains or link farms, suggesting a phishing or redirection scheme. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with techniques used to deliver malicious content or redirect users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://grossenbacher.co.nz/en/system/files/avoidance-training-certificates/4264017636.pdf
    • https://www.enwidth.com/sites/default/files/webform/resumes/43403042061.pdf
    • http://spotlight-sites.com/sites/default/files/webform/4279473489.pdf
    • http://spotlight-sites.com/sites/default/files/webform/93789740410.pdf
    • https://www.ofalloncasting.com/sites/default/files/webform/dapajinosez.pdf
    • https://www.ofalloncasting.com/sites/default/files/webform/68406293253.pdf
    • http://www.birdlifebotswana.org.bw/sites/default/files/webform/sightings-sketches/13349970620.pdf
    • https://natsihwa.org.au/sites/default/files/webform/filon.pdf
    • https://ambrose.edu/sites/default/files/webform/talizovub.pdf
    • https://www.pharoxglobal.com/sites/default/files/webform/6669476875.pdf
    • https://ambrose.edu/sites/default/files/webform/bunovodedodasu.pdf
    • http://portal-mysigma.com/system/files/student-proof/9555400870.pdf
    • https://www.blplegal.com/sites/default/files/webform/lolavojirubopikumu.pdf
    • https://ambrose.edu/sites/default/files/webform/juremetepatofuf.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=psicologia+organizacional+definicion+autores
    • https://community.princeton.edu/system/files/webform/xakefabobadu.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_off0000d2cc.bin
8f0461f1a82c6ae5d90679f835d12ff659990ba99c18eef9919c7057d63b0acf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD2CC 5240 bytes
font_01_sfnt_off0000e4b7.bin
adf4e650e27e24c4a9ab5fec2e1b7fceffe52f08d0734d6ebc9fd5ea94f6b5c2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE4B7 11392 bytes

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