Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fa950586278cf26…

MALICIOUS

PDF

75.2 KB Created: 2021-04-26 14:52:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1a801a58e0b83954d8d49224a45c8d03 SHA-1: d4687c169009fdc5ca1bb426024d62c7e7298d11 SHA-256: 6fa950586278cf265142e7fcd081dc42813511d14c3be0e895d3587e45f8f937
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link T1059.007 JavaScript

The PDF document contains heuristics indicating it is a link farm and a social engineering attack (ClickFix). The ML classifier and ClamAV detection strongly suggest malicious intent. The document body, though truncated, appears to be a lure for downloading drivers, which is a common pretext for malware delivery. The presence of embedded URLs, some of which are part of a link farm, further supports this. No scripts were extracted, but the overall structure and heuristics point to a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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.natsihwa.org.au/sites/default/files/webform/72917344941.pdf
    • https://ambrose.edu/sites/default/files/webform/lajeriz.pdf
    • http://www.guninetwork.org/system/files/webform/heirri_proposals/dagen.pdf
    • http://cicatsalud.com/html/sites/default/files/webform/61943826361.pdf
    • http://cicatsalud.com/html/sites/default/files/webform/kizosilubim.pdf
    • https://aboss.by/sites/default/files/webform/89266631471.pdf
    • http://www.friendlycc.com/sites/default/files/webform/98819861428.pdf
    • https://aboss.by/sites/default/files/webform/32639212941.pdf
    • https://ambrose.edu/sites/default/files/webform/58234525485.pdf
    • https://www.enwidth.com/sites/default/files/webform/resumes/ralivowu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=lenovo+y500+audio+drivers+for+windows+7
    • https://www.healthdata.org/sites/default/files/resumes/nufimogunuzin.pdf
    • https://minorsoncampus.princeton.edu/system/files/webform/wetesagepe.pdf
    • https://gradfutures.princeton.edu/system/files/webform/16157352895.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc7f.bin
4885a9638f7c905c9b70d337f08682337e0cdca012e4c8bc93313f549d4e46a6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDC7F 5212 bytes
font_01_sfnt_off0000ee6b.bin
be08826b348cf12d53a03d35fc48451c14e9518ba0680bce42f6fb71dcf85122		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE6B 10300 bytes
font_02_sfnt_off000111a3.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x111A3 4324 bytes

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