Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a9e2b0ceefe8c9a…

MALICIOUS

PDF

91.8 KB Created: 2021-01-25 13:36:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: f329022a8a6dcef9f965e116edea964a SHA-1: d4b7fb82af6248f7a9d89f713888a6f66e87a9d4 SHA-256: 9a9e2b0ceefe8c9af759af2f05482b0630e43c7b0f1c22c17d0c9b2114be1e71
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs and a heuristic firing for a 'link farm' on disposable hosting, indicating a phishing or malware distribution attempt. The presence of a 'download button' lure further supports this. ClamAV detection as 'Pdf.Phishing.Trojan' confirms the malicious nature.

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 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.
  • 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://trafficel.ru/aws?utm_term=stress+management+coping+skills+worksheet PDF link annotation
    • https://cdn.sqhk.co/pasojixaju/iaIjcAn/large_pencil_box_plastic.pdfIn PDF document text
    • https://cdn.sqhk.co/vejanozugova/ZETWHXw/28125750595.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501374/normal_5fc816d33cff5.pdfIn PDF document text
    • https://cdn.sqhk.co/koditisalupe/8BX9dzX/word_connect_answers_level_1517.pdfIn PDF document text
    • https://cdn.sqhk.co/gibuzini/LjjLWJp/2020_shelby_super_snake_truck_weight.pdfIn PDF document text
    • http://veronaital.space/zusab283zg.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374009/normal_5fe2b3a7f1ee5.pdfIn PDF document text
    • http://xsafak.com/homemade_burger_recipes_ukdgqtj.pdfIn PDF document text
    • http://zirosax.iblogger.org/9315446278.pdfIn PDF document text
    • http://kopavavabigi.66ghz.com/86962903922.pdfIn PDF document text
    • http://eroganoficial.site/382049395036hm6y.pdfIn PDF document text
    • http://distornyup.site/shooter_movie_cast_bob_lee_swaggerpnvrl.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4499309/normal_6008fe23370b4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bejiteviv.epizy.com/rumemoniravajifi.pdfIn PDF document text
    • http://kofupugixujodin.epizy.com/pevijen.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_off000129f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129F6 5604 bytes
SHA-256: 9ad294e323298214b7c62b897c9fd828bc69160a1ac142486aa044555cc30af4
font_01_sfnt_off00013ceb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CEB 10832 bytes
SHA-256: 8d3685374a047ae13bee5d7311ced23fe6c282d3013876c5c4614ffe38c05412