Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd93965a53cf1b8f…

MALICIOUS

PDF

71.8 KB Created: 2021-01-14 06:43:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: b8f99014b6e10788e997deeb08a8c3e5 SHA-1: 9aad74463c7674475243a8ef48caba6f719609a1 SHA-256: fd93965a53cf1b8f8add89d5634209936e5fd50742f4694bc4d50ee22a47a8f6
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics and a machine learning classifier. It contains a large number of embedded links, including one pointing to a known malicious redirector at 'https://cctraff.ru/aws?utm_term=best+free+android+phone+cleaner'. The document body is heavily obfuscated and appears to be junk data, suggesting the primary function is to host these links. The presence of numerous external PDF links indicates a link farm strategy, likely for SEO poisoning or to distribute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://cctraff.ru/aws?utm_term=best+free+android+phone+cleaner In PDF document text
    • https://kejobogufepemis.weebly.com/uploads/1/3/0/7/130775396/5383193.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458124/normal_5fed08e7910ac.pdfIn PDF document text
    • https://rafunegax.weebly.com/uploads/1/3/4/3/134350232/zabisadu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481663/normal_5fd662839661f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407818/normal_5ffa1ce8621d1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481411/normal_5fb8a6f70dc7d.pdfIn PDF document text
    • https://simomoluxaruto.weebly.com/uploads/1/3/4/8/134859410/wirarabiwu_xawokowara_metumuje.pdfIn PDF document text
    • https://dobekaveliwe.weebly.com/uploads/1/3/4/5/134599348/bixof_pefowujixuxi_pujebu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418746/normal_5fb8775b5c72f.pdfIn PDF document text
    • https://tekoxinir.weebly.com/uploads/1/3/4/6/134606092/vogez.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/xoguwavosuje/jijuvatobawoni.pdfIn PDF document text
    • https://s3.amazonaws.com/fasanag/zisenogoxuw.pdfIn PDF document text
    • https://s3.amazonaws.com/kewakuko/4679194827.pdfIn PDF document text
    • https://s3.amazonaws.com/pujirageg/unlimited_amazon_money_hack_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/tazopaju/vibesosagabopu.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA93 5292 bytes
SHA-256: f5618aab6547d6fe1b41cbeb21a633e991a04040c12009bc3c49d8b4eaf23c0a
font_01_sfnt_off0000ec92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC92 11036 bytes
SHA-256: fd8af16509f1d64f178a26542403bbc99925437ea63f5fc4e5ecc9cd2d5f87b7

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