Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6d27bc669bb4cbf…

MALICIOUS

PDF

77.7 KB Created: 2020-12-02 08:15:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 146c6bec28bc4f18f5d890b6ff4e9f5d SHA-1: dc2182978b5631871892c25e3c7493266ca7716e SHA-256: f6d27bc669bb4cbf0293efd178a1e98b2bb2d5a1995a4f4574b869ec547624ea
244 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 and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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://ggtraff.ru/strik?utm_term=hercules+and+antaeus+sculpture In PDF document text
    • https://cdn-cms.f-static.net/uploads/4412575/normal_5f97fa88450e7.pdfIn PDF document text
    • https://sowosevutab.weebly.com/uploads/1/3/4/3/134311467/6218772.pdfIn PDF document text
    • https://rapusixub.weebly.com/uploads/1/3/4/6/134631860/lijedumunalaxawogel.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379474/normal_5f8c929bb63cf.pdfIn PDF document text
    • https://nenojidadexodu.weebly.com/uploads/1/3/4/3/134351563/nuratogusen-gitowebuke-xodejavabegulof-zakilebuwixili.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389823/normal_5fbab940bfb8c.pdfIn PDF document text
    • https://segakimorepej.weebly.com/uploads/1/3/0/7/130738797/lafukanunimil.pdfIn PDF document text
    • https://bimotozego.weebly.com/uploads/1/3/4/8/134885309/gejulo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/dbdd151f-5fe7-4ba3-9b64-a1fece4b3f7a/ruvobegip.pdfIn PDF document text
    • https://s3.amazonaws.com/jixerubowi/blackboard_collaborate_chromebook.pdfIn PDF document text
    • https://s3.amazonaws.com/xilasisefi/5416776564.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/16588a7c-4b91-4059-9a09-5a617cbe57fc/mikubizilasalexaxuru.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac01af69-df2f-4360-a7c2-b9e04df9c2f4/40335436503.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000ff99.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xFF99 24156 bytes
SHA-256: 7363dd06639b20e1b742e6208f5f70318abe3cc7d50574698538b44057cecf0d
font_00_sfnt_off0000ca5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA5B 5028 bytes
SHA-256: 292cab523d4c4785921042163948785c2bccbcb723f0b25ca31b82a58529bd6c
font_01_sfnt_off0000db7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB7F 10544 bytes
SHA-256: df2b315c949c0f942136a235a39d76c7cdafba0dff2de1eaadff59238ffbc88f

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