Malicious PDF — malware analysis report

Static analysis result for SHA-256 4eccd2cc71e674db…

MALICIOUS

PDF

70.0 KB Created: 2021-01-16 11:41:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 6d5d5dbc71ad92dbfbdd8aeb77efb7b6 SHA-1: d23ef608730bd5c6bc7a70f3ad88df6e9f4965a5 SHA-256: 4eccd2cc71e674dba863a24fdff1c8ad1f0801bf75c7e0b4f6e99af48b0f0559
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one specifically pointing to 'trafftec.ru' and containing a 'utm_term' parameter suggesting a marketing or tracking lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high number of links on disposable hosting, reinforcing the malicious intent. ClamAV detection and ML classification further confirm its malicious nature, likely as a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://trafftec.ru/123?utm_term=hairspray+2+white+lipstick+year PDF link annotation
    • https://site-1196465.mozfiles.com/files/1196465/vcmi_for_android_apk.pdfIn PDF document text
    • https://nefolebar.weebly.com/uploads/1/3/4/4/134400051/2c6c1f698.pdfIn PDF document text
    • https://site-1175290.mozfiles.com/files/1175290/apostila_cade_simu.pdfIn PDF document text
    • https://site-1166068.mozfiles.com/files/1166068/50266382913.pdfIn PDF document text
    • https://site-1177706.mozfiles.com/files/1177706/informix_4gl_compiler_development.pdfIn PDF document text
    • https://sedezexe.weebly.com/uploads/1/3/4/3/134342112/safapokixolil.pdfIn PDF document text
    • https://site-1179185.mozfiles.com/files/1179185/17280772111.pdfIn PDF document text
    • https://pudafakomixi.weebly.com/uploads/1/3/4/5/134506615/diwaxoziz_nuzewijer_zoguj_wezakilesa.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/fifomi/xinebigapijo.pdfIn PDF document text
    • https://s3.amazonaws.com/xakusineba/41951020907.pdfIn PDF document text
    • https://s3.amazonaws.com/jiguwuzobozobaz/bowel_cancer_screening_nz_guidelines.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_off0000d4b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4B3 5372 bytes
SHA-256: 5e4fce891e249f10f9e302de6ba1a282a704b5104047e1bd0ec7cd2fbe50b5e8
font_01_sfnt_off0000e70a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE70A 10796 bytes
SHA-256: 6dffee3080e3507e64727b929c7be4a06b247f572ed5b823ac2a86b61a21b522

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