Malicious PDF — malware analysis report

Static analysis result for SHA-256 c582cfc5bd469f44…

MALICIOUS

PDF

67.8 KB Created: 2020-12-06 12:56:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 19f7288463a4c8d8c06305aace7be4d6 SHA-1: 9d424a6581156bcaca1be4c6e8b1c6bab7a635db SHA-256: c582cfc5bd469f443cf50407e3addd826c8b42e7ba2f153e0fc12e2e3917b312
252 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/strik?utm_term=ppsspp+gold+apk+free+download In PDF document text
    • https://nubonikajifubi.weebly.com/uploads/1/3/4/8/134882340/jusenorila.pdfIn PDF document text
    • https://dilopimejaz.weebly.com/uploads/1/3/4/4/134487403/demodetefor.pdfIn PDF document text
    • https://xemuputib.weebly.com/uploads/1/3/4/5/134506680/bazunipenitexazojezi.pdfIn PDF document text
    • https://wilixutisew.weebly.com/uploads/1/3/4/0/134095986/wuxaba.pdfIn PDF document text
    • https://zojusuvog.weebly.com/uploads/1/3/4/7/134762677/luxebudafoje.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417658/normal_5f9d6b3ce8414.pdfIn PDF document text
    • https://tumixivig.weebly.com/uploads/1/3/1/6/131636813/pogupewevivakovoxu.pdfIn PDF document text
    • https://lofizalu.weebly.com/uploads/1/3/4/6/134601384/pamepov.pdfIn PDF document text
    • https://pimitasemoz.weebly.com/uploads/1/3/4/6/134646318/8712784.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/wogikokuzotaxa/60798726715.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0bcfb2e537a05ef083615/t/5fc1d9f3f81c9a2a0ce58f30/1606539771095/40271368466.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0ea1fa8793968640865e0/t/5fc102f1fa04221c71437db9/1606484722723/blossom_blast_saga_1.1.1_mod_apk_unlimited_money.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbcfa9872f8b574a0f33879/1606220440708/51477375435.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_off0000ca3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA3C 5368 bytes
SHA-256: fd4e78761e6b3a4f61d5ee332d982981452044d77e598e1033aa47c61609d5ab
font_01_sfnt_off0000dca1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCA1 11324 bytes
SHA-256: 40a73bb6f471d222b8e1be124806d998ee5b387a7ad5eca53b570445e4c5c443

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