Malicious PDF — malware analysis report

Static analysis result for SHA-256 399bc142940fff95…

MALICIOUS

PDF

67.1 KB Created: 2020-11-24 13:46:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: ba132ce9fe79c7848872ec821cf26665 SHA-1: ce36821c030b4a01faa522391987cb52bc95b73d SHA-256: 399bc142940fff956b42f5089dcdc9033ec832877e249fda5fc1206373b29ae1
164 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM', with one prominent link pointing to 'https://trafffi.ru/123'. ClamAV also detected this file as 'Pdf.Phishing.Trojan-d2528dad23a95d95'. The presence of numerous external links suggests an attempt to redirect users to malicious sites or download further payloads, consistent with phishing or malware distribution tactics.

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://trafffi.ru/123?utm_term=man+diesels+scheduled+maintenance+guidelines PDF link annotation
    • https://kexinebig.weebly.com/uploads/1/3/4/3/134338338/3308273.pdfIn PDF document text
    • https://fimozafovobas.weebly.com/uploads/1/3/2/7/132741130/8217143.pdfIn PDF document text
    • https://tuvaxijilitug.weebly.com/uploads/1/3/4/6/134668501/newegabi.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/sonutopexaramuf/saxofuxapo.pdfIn PDF document text
    • https://s3.amazonaws.com/befevifa/5362381401.pdfIn PDF document text
    • https://s3.amazonaws.com/megodipewukitoj/r_r_pizza_thatcher.pdfIn PDF document text
    • https://s3.amazonaws.com/dakebesuvum/p5_death_confidant_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/dukexajuj/2276978656.pdfIn PDF document text
    • https://s3.amazonaws.com/palikuvexake/sepamikubaxerimi.pdfIn PDF document text
    • https://s3.amazonaws.com/saxefi/jawbone_up_2_setup_instructions.pdfIn PDF document text
    • https://s3.amazonaws.com/xakapudakadu/free_monthly_calendar_printable_2020_word.pdfIn PDF document text
    • https://s3.amazonaws.com/figugipopar/household_budget_template_google_sheets.pdfIn PDF document text
    • https://s3.amazonaws.com/novipaliwid/bacteria_capsule.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_off0000c773.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC773 5264 bytes
SHA-256: ed4e9979f925c09b20bb5365a9673821718213ffb6ab6e856e6bf8a41539c378
font_01_sfnt_off0000d940.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD940 11236 bytes
SHA-256: bab238101d773bfd849edf063ce203085f1e02084b2a953952563a571df3c6c7

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