Malicious PDF — malware analysis report

Static analysis result for SHA-256 83f59ce460a43413…

MALICIOUS

PDF

74.6 KB Created: 2021-01-11 05:42:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: a412cc931b26860c4a98f374d7bc2c97 SHA-1: ed3b74b06289934d6681445062f2a27995684378 SHA-256: 83f59ce460a434132ba62c78b97c43fa11e8cee98efb89dde81c53eb7f8f028d
214 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, and another for a PDF link farm. The embedded URLs, particularly 'https://traffmen.ru/123?utm_term=woodward+reservoir+phone+number', are indicative of phishing or malicious redirection attempts. The ML classifier and ClamAV detection further support the malicious nature of this document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffmen.ru/123?utm_term=woodward+reservoir+phone+number In PDF document text
    • https://cdn.sqhk.co/kelanadu/gpU3ghq/muxoziva.pdfIn PDF document text
    • https://cdn.sqhk.co/xasakeza/bhbYR4s/beraxet.pdfIn PDF document text
    • https://cdn.sqhk.co/bogabixexuja/gfD8Y46/melody_music_meaning.pdfIn PDF document text
    • https://cdn.sqhk.co/baxemazisod/PidjgiH/10169473878.pdfIn PDF document text
    • https://cdn.sqhk.co/sazalevimit/Ohjhcja/97591433759.pdfIn PDF document text
    • https://cdn.sqhk.co/numokafas/igxqgjR/7975572548.pdfIn PDF document text
    • https://lebotuzipum.weebly.com/uploads/1/3/4/5/134519329/divuligege.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
    • https://s3.amazonaws.com/foneniz/38454009351.pdfIn PDF document text
    • https://s3.amazonaws.com/waxegatulo/lujuxoleladotuvasupu.pdfIn PDF document text
    • https://s3.amazonaws.com/semuxemakaw/48397567750.pdfIn PDF document text
    • https://s3.amazonaws.com/godoremitiwuja/ulcerative_colitis_meal_plan.pdfIn PDF document text
    • https://s3.amazonaws.com/biwubeleba/resignation_letter_template_australia_fair_work.pdfIn PDF document text
    • https://s3.amazonaws.com/bojafazes/stream_movies_android_tv_box.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_off0000db82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB82 5276 bytes
SHA-256: bd21033645bc57dac7a3afdbd9804a5ace039a8d181273be421644c93cb2d043
font_01_sfnt_off0000ed4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED4D 10072 bytes
SHA-256: 462752aac7acf4e1ea7be53f3a9ea16463fe56eced6caa1dc0a4a41f0c681f3c
font_02_sfnt_off00010fe2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FE2 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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