Malicious PDF — malware analysis report

Static analysis result for SHA-256 c44e28606eea576b…

MALICIOUS

PDF

76.4 KB Created: 2021-01-14 18:14:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 91b483ee47973f7abcc52599e0098471 SHA-1: b3b4d3a78bddc98d583c2a6cbe9613fb992a36c3 SHA-256: c44e28606eea576b10065885273136f70fdd9fd9cf06294b62b014289bb050ea
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of embedded links pointing to external PDF documents hosted on various domains, many of which appear to be disposable or used for SEO link farming. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' indicates at least one link directs to known malicious infrastructure. This suggests the document's primary purpose is to act as a lure, potentially for phishing or to distribute further malware, rather than providing legitimate content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • 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://traffine.ru/123?utm_term=is+eufora+all+natural In PDF document text
    • https://revejoduxu.weebly.com/uploads/1/3/4/2/134266419/9534698.pdfIn PDF document text
    • https://cdn.sqhk.co/sojowidaz/0XghgfA/children_s_doctor_dentist.pdfIn PDF document text
    • https://cdn.sqhk.co/makubeku/owLjaNQ/rivals_at_war_firefight_mod_apk_no_root.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425784/normal_5ff709fe2f629.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471474/normal_5faaa9eeecdc4.pdfIn PDF document text
    • https://cdn.sqhk.co/kafevinuva/dBghico/second_hand_dog_runs_for_sale_ireland.pdfIn PDF document text
    • https://mezuxanivatanid.weebly.com/uploads/1/3/4/4/134499991/mavanizel_voburiwawabusa_woxemipagapamif_gujavavadawuti.pdfIn PDF document text
    • https://nulixedupalaz.weebly.com/uploads/1/3/0/7/130739510/6172201e.pdfIn PDF document text
    • https://cdn.sqhk.co/weruvewo/EkhdWjd/jamunovoxopugowikar.pdfIn PDF document text
    • https://satataro.weebly.com/uploads/1/3/5/3/135350270/cc4bf1b86643fa2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456369/normal_5fd3cb03b1de6.pdfIn PDF document text
    • https://cdn.sqhk.co/xogovofofi/fjbhQjj/rush_racing_movie_cast.pdfIn PDF document text
    • https://misikeni.weebly.com/uploads/1/3/4/3/134336029/1466649.pdfIn PDF document text
    • https://cdn.sqhk.co/jakufomego/Liewpxm/baxiwotizuzezezarawiji.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000ee22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE22 4696 bytes
SHA-256: 06d82a954c80448f02d17cfd0b33c1d99ced2aed8847ece5e02b9ac8af8354fa
font_01_sfnt_off0000fe24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE24 11528 bytes
SHA-256: 150c23ff434b198a26dc79249de0ef07d5f068a17872a6e33814e899379172fc

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