Malicious PDF — malware analysis report

Static analysis result for SHA-256 734d6cda4760237f…

MALICIOUS

PDF

72.6 KB Created: 2020-11-17 11:42:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: f4f3861b3873967b41798308379489b5 SHA-1: 1661eb4034b86c627eebff2ef730d5430fae87dd SHA-256: 734d6cda4760237fc5d40e52c1f3082bc1af08ad955d0012c8ff8a2e5dfbbedc
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to disposable domains or link farms, a common tactic for SEO poisoning and phishing. One of the primary links directs to a known malicious redirector, indicating a high likelihood of malicious intent. The ML classifier and ClamAV also flagged this file as malicious, supporting the assessment.

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://ggtraff.ru/strik?utm_term=cameron+surgery+textbook+free+download In PDF document text
    • https://sitizoxibe.weebly.com/uploads/1/3/4/3/134317871/wonosisa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481684/normal_5fb2618aefd51.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393889/normal_5faadf1b9732f.pdfIn PDF document text
    • https://sujegido.weebly.com/uploads/1/3/4/6/134695044/f571f6f1577.pdfIn PDF document text
    • https://xijonezamo.weebly.com/uploads/1/3/1/4/131407630/5912550.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378164/normal_5f9f8f8a68168.pdfIn PDF document text
    • https://vodexekuteb.weebly.com/uploads/1/3/0/7/130776001/2021312.pdfIn PDF document text
    • https://xoraxabaxid.weebly.com/uploads/1/3/2/6/132682630/3382002.pdfIn PDF document text
    • https://jakedekokobara.weebly.com/uploads/1/3/1/3/131381480/nuziwozonugof.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388413/normal_5f8fecf0b02fb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • https://s3.amazonaws.com/tapexiw/airline_industry_in_malaysia.pdfIn PDF document text
    • https://s3.amazonaws.com/putelekireza/psychiatry_fellowships_in_india.pdfIn PDF document text
    • https://s3.amazonaws.com/zifozujiwi/hotmail_outlook_login.live.com.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
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bc65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC65 5600 bytes
SHA-256: e056a1a2040e57dffab5f83d41cad53a7e6359ad47a60c31321a8d23a958ea9a
font_01_sfnt_off0000cf74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF74 13440 bytes
SHA-256: 52daad60859d3eba7f17f781b8e5fa2db78c8e87a103596552d2fbcdadff6408
font_02_sfnt_off0000f3b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3B8 9932 bytes
SHA-256: 98cf163524129569858caeec03681929b0c283b0918e2683243fd2691aa6c267

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