Malicious PDF — malware analysis report

Static analysis result for SHA-256 a346695fdc405990…

MALICIOUS

PDF

73.9 KB Created: 2021-01-12 10:47:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: dd2663024cf4140a415d42d323bce405 SHA-1: 05068428baa1b506c0bda854abc3ff7b53aa514d SHA-256: a346695fdc405990c98fdcb19ecf1cc5ad6baea2c4c46223cfc55a389986ccea
164 Risk Score

Malware Insights

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

The PDF document contains a lure related to a 'credit reporting agency dispute letter template', which is a common phishing tactic. It also contains a high number of external links, many of which are to PDF files, suggesting a link farm or redirection mechanism. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution via the embedded URLs.

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
  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://traffnew.ru/aws?utm_term=credit+reporting+agency+dispute+letter+template PDF link annotation
    • https://site-1173612.mozfiles.com/files/1173612/beluwegakeru.pdfIn PDF document text
    • https://site-1174503.mozfiles.com/files/1174503/kung_fu_tea_menu_vegan.pdfIn PDF document text
    • https://folejate.weebly.com/uploads/1/3/4/9/134902611/6688300.pdfIn PDF document text
    • https://degodowaserujes.weebly.com/uploads/1/3/4/4/134494515/niduw-tovuse.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/ninazarila/57128700980.pdfIn PDF document text
    • https://s3.amazonaws.com/moduxanakuri/group_facilitation_planning_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/tesotiwapax/fossil_fighters_champions.pdfIn PDF document text
    • https://s3.amazonaws.com/tuzamada/37465457801.pdfIn PDF document text
    • https://s3.amazonaws.com/nuxepiduded/bsd405_lunch_menu.pdfIn PDF document text
    • https://s3.amazonaws.com/nawosineromigi/tagalog_christmas_songs_lyrics.pdfIn PDF document text
    • https://s3.amazonaws.com/juzewojavomofew/mariage_d_amour_guitar_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/bokofapig/komexifuxezejaz.pdfIn PDF document text
    • https://s3.amazonaws.com/fifomi/wadetufos.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e3e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3E3 5400 bytes
SHA-256: 91b22901a6c6e98b7c4884eb2ba91264153d8ec9060bb139710f08ae3b6f88b6
font_01_sfnt_off0000f632.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF632 10604 bytes
SHA-256: 7bb3dba5b232d5afb3a107c02900ba2a1957aed24864619daaf41b6747e3b08d

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