Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb73ac01553f00bb…

MALICIOUS

PDF

62.5 KB Created: 2021-01-13 22:29:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: d9290262c82c2f7b08edf5123b8634d3 SHA-1: a47546662f28a458af2194b8c04407d301f8e8e9 SHA-256: cb73ac01553f00bbd20cc2fbafdc36bbb67e6f4003d83f30132fe7f80a79acf5
244 Risk Score

Malware Insights

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

This PDF file was detected as malicious by multiple heuristics and a machine learning classifier, indicating a phishing or malicious redirector attempt. It contains a large number of embedded links, many pointing to disposable domains and one specifically to a known malicious redirector infrastructure. The document body is heavily obfuscated and appears to be junk data, suggesting the primary purpose is to host these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • 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.
  • 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.
  • 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://cctraff.ru/aws?utm_term=simple+and+complex+sentences+worksheet+pdf In PDF document text
    • https://sovawetozinunur.weebly.com/uploads/1/3/1/4/131407226/badaxesuw-ganebim.pdfIn PDF document text
    • https://nokajadum.weebly.com/uploads/1/3/4/8/134887388/5011610.pdfIn PDF document text
    • https://dinabowufijub.weebly.com/uploads/1/3/4/7/134751612/2c4d60a48.pdfIn PDF document text
    • https://nubeboganiroj.weebly.com/uploads/1/3/1/3/131384383/5901699.pdfIn PDF document text
    • https://kolokizegilo.weebly.com/uploads/1/3/4/3/134370221/tukogunado.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502439/normal_5fd8d90643407.pdfIn PDF document text
    • https://site-1174038.mozfiles.com/files/1174038/translate_all_text_and_voice_translator_apk_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376601/normal_5fb78b8dc26e5.pdfIn PDF document text
    • https://jelalepoxona.weebly.com/uploads/1/3/4/9/134901657/tanox_nexulazatakopug_deposi_bozibenavaj.pdfIn PDF document text
    • https://cdn.sqhk.co/fabupiguboxa/gg2igGk/lefawemisoxumegixenos.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/resixexi/68771880883.pdfIn PDF document text
    • https://s3.amazonaws.com/xisefowu/academy_stars_4_pupil_s_book.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_off0000b7f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7F1 5720 bytes
SHA-256: d152308fc2432db74472635f1a77376a35c3870b889f7fecf0759d5efd2a7827
font_01_sfnt_off0000cb55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB55 9764 bytes
SHA-256: 91808cc49ee890f3d78af6a3f508350570b04a0426d110768a73f93d7f24997a

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