Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c3b33a45bc03e25…

MALICIOUS

PDF

73.0 KB Created: 2021-01-15 21:04:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: b48dff35560f995696707f2001658ab0 SHA-1: ef5149d1270afe03f03812ef1385d071d83c67ac SHA-256: 8c3b33a45bc03e2561d23d8f09bbdea43d24f6eb487a49379aa419b14de19e10
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying it as a "PDF_SEO_LINK_FARM" containing 30 external PDF links. One of these links, "https://trafffi.ru/123?utm_term=large+plasma+ball+light", is embedded in the document's text, suggesting a lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the extensive link farm points to a coordinated effort to redirect users.

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://trafffi.ru/123?utm_term=large+plasma+ball+light PDF link annotation
    • https://cdn.sqhk.co/jadepibake/whghcjh/9283743527.pdfIn PDF document text
    • https://cdn.sqhk.co/bidomutarili/jheCxu4/wixuwowukawatunafixawuv.pdfIn PDF document text
    • https://pesajupamobe.weebly.com/uploads/1/3/1/6/131607203/litovivof_sijomidigeza_favusanoti_nabiwemed.pdfIn PDF document text
    • https://cdn.sqhk.co/monasomeb/gfngijc/28755631965.pdfIn PDF document text
    • https://tigigedilopufam.weebly.com/uploads/1/3/5/4/135400960/d31e3d4dac3c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477156/normal_5fd9cb451240b.pdfIn PDF document text
    • https://kafaziwe.weebly.com/uploads/1/3/1/0/131070109/lolobojexuk-mewuki.pdfIn PDF document text
    • https://cdn.sqhk.co/vovusupa/g7gcgfU/vowav.pdfIn PDF document text
    • https://cdn.sqhk.co/lolajelor/hjGQHhf/lisa_fruitman_dentistry_prof._corp.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475379/normal_5fbac516d6a82.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/palikuvexake/36268408929.pdfIn PDF document text
    • https://s3.amazonaws.com/geradi/sefeduporezelasi.pdfIn PDF document text
    • https://s3.amazonaws.com/nuruvapozixix/27244173008.pdfIn PDF document text
    • https://s3.amazonaws.com/purixifusipelid/pathology_book_by_ramdas_nayak.pdfIn PDF document text
    • https://s3.amazonaws.com/zamemigojat/cambridge_guided_bus_timetable.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_off0000e17b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE17B 5312 bytes
SHA-256: 1978b7c9fbb2d177e235f6b0136ffe058bb8cd244e134f57a80b8db5e86cadc4
font_01_sfnt_off0000f35c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF35C 10300 bytes
SHA-256: 2ee84150cf36a0a0fcb417455297b438bb79f7784489c62bc4cf9ebee3e1c8b8

Open this report in the interactive analyzer, or submit your own file for analysis.