Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2d7cb7adb8857c6…

MALICIOUS

PDF

68.3 KB Created: 2021-01-10 01:18:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: cc91a955cd9821416caa5edacd4bae47 SHA-1: 7d859a6c31d468fe1aee7a015a2e0cea8d535fef SHA-256: d2d7cb7adb8857c6ce2ffc2d8b635b5a83b8da16d9e2c9d7aaa33d15096789d5
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are SEO-optimized and point to potentially malicious domains, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a book title, suggesting a lure to a website disguised as a search result.

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 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.
  • 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=cronica+de+una+muerte+anunciada+pdf+mega PDF link annotation
    • https://cdn.sqhk.co/sigidezok/jiihjay/national_geographic_telescope_nt114cf_app.pdfIn PDF document text
    • https://sufotope.weebly.com/uploads/1/3/0/7/130775917/27ffd.pdfIn PDF document text
    • https://rexakutomas.weebly.com/uploads/1/3/0/7/130739652/pugilavusor.pdfIn PDF document text
    • https://cdn.sqhk.co/gazejuruni/aien2ha/lawezafovariva.pdfIn PDF document text
    • https://site-1180311.mozfiles.com/files/1180311/plants_vs_zombies_2_garden_warfare_pc_requisitos.pdfIn PDF document text
    • https://fadefewili.weebly.com/uploads/1/3/4/3/134316521/pojeronezib.pdfIn PDF document text
    • https://jisuzinux.weebly.com/uploads/1/3/4/6/134671095/domen-lepegibasirow-guwimu-nobofurinogibo.pdfIn PDF document text
    • https://site-1172154.mozfiles.com/files/1172154/high_speed_car_racing_games.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/pewebopufupe/aldomet_dosage_form.pdfIn PDF document text
    • https://s3.amazonaws.com/tesapibebujep/barco_clickshare_cse-_200_installation_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/ladojenefe/bertazzoni_oven_user_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/vutame/binomial_theorem_worksheet_with_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/tobaziw/54832925034.pdfIn PDF document text
    • https://s3.amazonaws.com/mubemutolewe/19908232940.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_off0000cbe3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBE3 5168 bytes
SHA-256: 13a3e4bfbbfd359541af73d0ca4cf078f6c8bced3609caf021201b6e8b6a4901
font_01_sfnt_off0000dd66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD66 11312 bytes
SHA-256: 92dac075a2fa07fed179a80f4c4785654f1b6b2a1cd0ef9174e9106023b22e13

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