Malicious PDF — malware analysis report

Static analysis result for SHA-256 39da6d28da5a6709…

MALICIOUS

PDF

70.4 KB Created: 2021-02-17 08:28:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: bbe5b18c34f8eabb35e50fe30641488f SHA-1: 8805a9dcaaef000dedd1969f317ddd746829e9a6 SHA-256: 39da6d28da5a67096a8266bca97bb6e71a18930f48fec7083454e56b7de7dcfe
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm designed to obscure the ultimate destination. The document body, though heavily obfuscated, suggests a lure related to free PDF downloads, consistent with phishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://maypoin.ru/123?utm_term=hindi+speaking+course+through+telugu+pdf+free+download PDF link annotation
    • http://arenda-comp.space/nazapml0qh.pdfIn PDF document text
    • http://kpovli.ru/sutizixasuvukonisiwufgg0qw.pdfIn PDF document text
    • https://vizepojazitebag.weebly.com/uploads/1/3/4/1/134108988/dewap.pdfIn PDF document text
    • http://pufaxokijajijev.22web.org/44558764345.pdfIn PDF document text
    • http://betflixguvenilirmi.com/44096502180tad44.pdfIn PDF document text
    • http://ecoterritory.store/information_about_apiculture_centre_and_gathersmlqs.pdfIn PDF document text
    • http://1xbet-sportstavki.fun/app_to_free_games_for_pc9prrf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://zajozikudesurek.epizy.com/69721548367.pdfIn PDF document text
    • https://s3.amazonaws.com/radubozufiwo/nilewomafegerogigiwevose.pdfIn PDF document text
    • http://reluwiz.epizy.com/rotiwepororagewiduxefap.pdfIn PDF document text
    • http://ruvuzatopaz.rf.gd/12688715963.pdfIn PDF document text
    • http://gisipusizen.rf.gd/chagas_colombia.pdfIn PDF document text
    • https://s3.amazonaws.com/befarekogol/aegisub_karaoke_effect_free.pdfIn PDF document text
    • http://valogaberel.rf.gd/delaware_annual_franchise_tax_report_extension.pdfIn PDF document text
    • http://joluvolob.epizy.com/gumamepebetozajonuxaxil.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c6a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6A9 5416 bytes
SHA-256: 73fb2059d958c76122b4b4d3c7c2d47ad917b98900ea60c244c16a5220377388
font_01_sfnt_off0000d917.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD917 10696 bytes
SHA-256: 7c27f7b4e60dffa488d0014e5222cd9a2ba69b28e98795733aa91c479b342f4b
font_02_sfnt_off0000fdab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDAB 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230