Malicious PDF — malware analysis report

Static analysis result for SHA-256 db6aef0faaed4513…

MALICIOUS

PDF

80.0 KB Created: 2021-01-05 11:13:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 8ec695234c09cafaa7b51ae593348f1c SHA-1: cf3bf9810ea24b575db03c21606302f096ca97b1 SHA-256: db6aef0faaed45130d7c1ad20844d5d24517815247adc4a91c33cfef1b1a9c6d
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics and a machine learning classifier, indicating it likely serves as a phishing or redirection lure. The embedded URLs point to a link farm, suggesting an attempt to direct users to potentially harmful content or further malicious sites. The ClamAV detection as 'Pdf.Phishing.Trojan' reinforces the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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://traffmen.ru/123?utm_term=dual+12+inch+subwoofer+specs In PDF document text
    • https://cdn-cms.f-static.net/uploads/4393761/normal_5fa52f5879be8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393034/normal_5fd83d266d565.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381766/normal_5fadac770b0a9.pdfIn PDF document text
    • https://cdn.sqhk.co/fijajiles/fihaggq/japan_drag_racing_2d_apk_mod.pdfIn PDF document text
    • https://lelidejob.weebly.com/uploads/1/3/4/6/134643066/5612567.pdfIn PDF document text
    • https://robubafo.weebly.com/uploads/1/3/4/5/134588337/1589915.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383467/normal_5fe8e7be431a4.pdfIn PDF document text
    • https://cdn.sqhk.co/zifiguwosu/63MgfXA/car_driving_games_for_pc_windows_10.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449602/normal_5ff3373c61d20.pdfIn PDF document text
    • https://cdn.sqhk.co/girewobo/hdicFhf/carx_drift_racing_lite_apk.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_off0000fd49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD49 5520 bytes
SHA-256: dda824b11e8094e8fd38db9d1c6cc343ffd88569c7be62d092756e8d90be8385
font_01_sfnt_off00011025.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11025 10360 bytes
SHA-256: e516e656ee32c74a18516b4621d9dd4774e3629b46be01df617489e36b75487e

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