Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb2a1d62104913b8…

MALICIOUS

PDF

67.3 KB Created: 2020-12-23 10:48:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 3a07611e0796bda59ae0b46804f5f91a SHA-1: 4ef69badb4b97505a7a56ea708c52f28d28f172d SHA-256: cb2a1d62104913b86e2900feccb9bc206bfdbe5281a660baac20ba9ffcd6a2ec
222 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a critical heuristic firing for a malicious redirector link, pointing to a URL that appears to be part of a link farm. The ML classifier also strongly flagged this PDF as malicious. The presence of a download button lure and the ClamAV detection further support a malicious intent, likely to deliver a second-stage payload or phish for information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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.
  • 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=dragon+wallpaper+3d+hd+download In PDF document text
    • https://cdn-cms.f-static.net/uploads/4409248/normal_5fa45d1ab7179.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470389/normal_5fb92d51639b2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366302/normal_5fb80f5f72634.pdfIn PDF document text
    • https://vopilejuwe.weebly.com/uploads/1/3/1/4/131407469/dd37122.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371786/normal_5f885915ae9a3.pdfIn PDF document text
    • https://rozonamofo.weebly.com/uploads/1/3/4/7/134751518/3305603.pdfIn PDF document text
    • https://xiforamuti.weebly.com/uploads/1/3/4/6/134611992/4758403.pdfIn PDF document text
    • https://xitukuwelup.weebly.com/uploads/1/3/4/3/134340625/acba796e1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369643/normal_5fa0948389e53.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/legapatatezisa/bajaj_allianz_ulip_policy_surrender_form.pdfIn PDF document text
    • https://s3.amazonaws.com/jozaponi/99960039372.pdfIn PDF document text
    • https://s3.amazonaws.com/bededuxotulapil/rpg_maker_ace_character_template.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_off0000c95c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC95C 5296 bytes
SHA-256: e5a8c8932bcc4c36d51c195f9658b744953a61fb74327bf0c41ea883584143f3
font_01_sfnt_off0000db73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB73 10936 bytes
SHA-256: 3608d57e8c4b5262d425e7bf12fcbaa69382030ccc4c8fdc3b8cf06cd7dd695d

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