Malicious PDF — malware analysis report

Static analysis result for SHA-256 4db16d7771323b8e…

MALICIOUS

PDF

73.3 KB Created: 2020-12-04 11:39:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: ab38c264e271ec7b80cb7234f400298b SHA-1: b26986a5b0736f253c071512ff588093569a1a94 SHA-256: 4db16d7771323b8ecffd5ee23bf5db0d865f6116a85a4911f3728b8dd3879871
214 Risk Score

Malware Insights

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

The file is identified as malicious by multiple heuristics and a machine learning classifier, specifically flagging it as a redirector link and part of a link farm. The presence of numerous embedded URLs, including one pointing to a known malicious redirector, suggests an attempt to lure users to external, potentially harmful content. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing or spamming campaign.

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://traffking.ru/strik?utm_term=the+windmills+of+your+mind+dusty+springfield In PDF document text
    • https://cdn-cms.f-static.net/uploads/4449009/normal_5fba8807ab93a.pdfIn PDF document text
    • https://negapisege.weebly.com/uploads/1/3/4/6/134635707/4909286.pdfIn PDF document text
    • https://gudatopizesibi.weebly.com/uploads/1/3/4/4/134472507/kerawiza.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/8b1d54e2-760a-4d08-9556-4699c0ab311d/21300318223.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b8b01dff-77b1-451c-96e3-96bf462cf327/73151067293.pdfIn PDF document text
    • https://s3.amazonaws.com/xoguwavosuje/medicare_guidelines_for_enteral_nutrition_reimbursement.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/13c48119-c13d-4697-acc3-bb89fcc12207/13490709756.pdfIn PDF document text
    • https://s3.amazonaws.com/lusabifef/phone_answers_calls_on_speaker.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b0208335-8c68-4d36-918a-30b5d29fa0fc/skyrim_se_caco_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/dixaleko/pencil_drawing_anatomy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/079725e7-fbd0-4c51-9765-0f2ea1d45a40/virus_shawl_pattern_bella_coco.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/85442f30-87dd-4ba4-8478-f34eb03e46c8/14481378098.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF7C 4064 bytes
SHA-256: fa591d4a62d3856a97791e5a4218d63c9897bac8cdca6da6d064fa57631ea359
font_01_sfnt_off0000dde4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDE4 5388 bytes
SHA-256: 719c5a35f0534875247981e89a7f1926da793c988aed022ec654efbb23a27e7a
font_02_sfnt_off0000f02c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF02C 12204 bytes
SHA-256: 5a405bb3853cd233a067e70ac55efba4e2d08f7ac57cf55b32204c0dbd00ce1f

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