Malicious PDF — malware analysis report

Static analysis result for SHA-256 79b6ed08e5ce4c94…

MALICIOUS

PDF

75.2 KB Created: 2021-01-13 07:44:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6cf7861cabc0cc3a90c9c30317c6a8d0 SHA-1: 99bcec922a729ecfb05388f79f321bf0a3c37c47 SHA-256: 79b6ed08e5ce4c94e57d02ece5cd3568e68fc04ce6b281296352f795580924a2
222 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains multiple embedded links to known malicious redirector infrastructure and a link farm, indicating an attempt to direct users to harmful websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. Although no scripts were extracted, the PDF structure and embedded URLs point towards exploitation for client execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://ggtraff.ru/123?utm_term=finish+line+return+policy+customer+service
    • https://cdn.sqhk.co/bowewulaxam/fjdjiRO/50544467129.pdf
    • https://cdn.sqhk.co/xeduwukaxusa/E8pgdgf/aaron_jones_injury_update_twitter.pdf
    • https://site-1176151.mozfiles.com/files/1176151/delhi_metro_map_master_plan_2021.pdf
    • https://site-1176116.mozfiles.com/files/1176116/close_up_pics_2_answers_level_6.pdf
    • https://cdn.sqhk.co/vujagefamig/2d29n7W/revomudazinelazanabon.pdf
    • https://cdn.sqhk.co/bitaxukezor/jhcLieF/lidoxelaxepunepiw.pdf
    • https://cdn.sqhk.co/jivapereb/hjJija7/detilivojoged.pdf
    • https://cdn.sqhk.co/tidaxetosi/aycjKih/jizifapomiwivik.pdf
    • https://site-1174038.mozfiles.com/files/1174038/all_video_player_hd.pdf
    • https://site-1174689.mozfiles.com/files/1174689/lenutakanur.pdf
    • https://rupibofog.weebly.com/uploads/1/3/1/6/131607232/devitulewevuwatulodo.pdf
    • https://site-1177113.mozfiles.com/files/1177113/xegulujuwaviwakunos.pdf
    • https://vadurevagide.weebly.com/uploads/1/3/3/9/133999829/04210f57e.pdf
    • https://site-1168150.mozfiles.com/files/1168150/newborn_twins_baby_care.pdf
    • https://cdn.sqhk.co/jabosuve/fIJ6hdE/jogirurufimitanodow.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/daxemo/77540510400.pdf
    • https://s3.amazonaws.com/subud/bagepavotarezamediko.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_off0000e9fd.bin
b1716181958a4b1de0c67c7a26852ae4b3251e44f8d1527bed448c68d6a04491		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE9FD 5080 bytes
font_01_sfnt_off0000fb30.bin
55389a9630b238e79c14aae9c77dee32b31fcf4f10a0184bf399446a6e3ad442		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB30 10688 bytes

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