Malicious PDF — malware analysis report

Static analysis result for SHA-256 43ab8845ac92b8aa…

MALICIOUS

PDF

63.4 KB Created: 2021-01-31 05:08:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: b83f5499ba4e07be8c74dff1f2d60ce4 SHA-1: 17749e3861200ae321160d160da9b2c979d6d4a0 SHA-256: 43ab8845ac92b8aac107dc1e652d3d966d5a6aebc19b23bf9c15bbeb86cde96e
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable domains and are flagged as potentially malicious or unknown. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as a phishing trojan. The document body, though heavily obfuscated, suggests a lure related to a 'table tennis score sheet template', which is a common tactic to disguise malicious content.

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://trafftec.ru/wb?keyword=table%20tennis%20score%20sheet%20template PDF link annotation
    • http://avto-document.site/21193996259exac9.pdfIn PDF document text
    • http://health-top.ru/mevemonurakuqlwjf.pdfIn PDF document text
    • http://boomua.site/shaolin_kung_fu_animal_formsq7x1x.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404512/normal_5fcb3b4878f31.pdfIn PDF document text
    • http://trenketo.buzz/toshiba_battery_driver7hqtp.pdfIn PDF document text
    • http://slimitalia.space/jikebojumopozonlpkkv.pdfIn PDF document text
    • http://g2am2e.xyz/tesesivutidokojumoworudekez0eo.pdfIn PDF document text
    • http://kernig.online/nike_brand_guidelines_20193nzvt.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411479/normal_5fef12f229329.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/dazifozixawus/astroneer_xbox_one.pdfIn PDF document text
    • http://fomabobas.epizy.com/aashto_t96.pdfIn PDF document text
    • http://gogewarixisude.epizy.com/brother_in_arms_2_apk_data_obb.pdfIn PDF document text
    • http://vubixegigag.rf.gd/19123524574.pdfIn PDF document text
    • http://loxosufodu.epizy.com/glows_and_grows_template_word.pdfIn PDF document text
    • https://s3.amazonaws.com/gudukupir/business_letter_template_ms_word.pdfIn PDF document text
    • https://s3.amazonaws.com/fexuror/gevojolose.pdfIn PDF document text
    • https://s3.amazonaws.com/wajibile/animation_software_for_android_mobile.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_off0000bdc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDC9 5260 bytes
SHA-256: 6ac9470f4dee61897ff70040237600f6e03ea88e0221f0310cc70968a765e096
font_01_sfnt_off0000cf7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF7D 9600 bytes
SHA-256: 6a50788fea1277cdd141afdd8294c7705588c0d1ac0f1df3b83101074f93db12

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