Malicious PDF — malware analysis report

Static analysis result for SHA-256 40a0f7ec3c974550…

MALICIOUS

PDF

65.2 KB Created: 2020-11-09 23:39:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 987acf526b746e45b43e7de9a37bf902 SHA-1: d067f78e60f6c62f49d3cc50d3b736b94db8b9df SHA-256: 40a0f7ec3c9745505c62434320c054828607d6413d6b59761135d5cd0e6d5d2b
214 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a redirector link and a link farm, indicating a potential phishing or SEO manipulation scheme. ClamAV also detected it as a phishing trojan. The embedded document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a date, suggesting it might be a generated document used for malicious purposes. The primary malicious IOC is the redirector URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/123?keyword=hanafuda+koi+koi
    • https://cdn-cms.f-static.net/uploads/4415077/normal_5fa5420499305.pdf
    • https://pidivupam.weebly.com/uploads/1/3/4/3/134327465/kunenoga.pdf
    • https://cdn-cms.f-static.net/uploads/4381098/normal_5f8dc30ba56dc.pdf
    • https://femitinekabel.weebly.com/uploads/1/3/1/4/131437683/jomer_sefawufox.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/5662ac87-493b-4205-bcf5-c9f3a11c3acb/52489892473.pdf
    • https://uploads.strikinglycdn.com/files/9e434994-a6f2-4345-ae25-3b4af1b7e511/89630642262.pdf
    • https://uploads.strikinglycdn.com/files/c4bb0f01-7749-43c1-bdf8-ab8209b631e4/vulorufazuneka.pdf
    • https://uploads.strikinglycdn.com/files/e4f26e55-ded4-4fb0-a507-ddb571a70d85/78404613246.pdf
    • https://uploads.strikinglycdn.com/files/f8cb5487-7da2-4bb0-b384-1a31a02afbae/demupefenexe.pdf
    • https://uploads.strikinglycdn.com/files/1ef85792-85c8-4a2f-bd5d-c35fb328959f/bimunij.pdf
    • https://s3.amazonaws.com/sabobenuwe/how_to_get_free_gold_in_bullet_force_no_hack.pdf
    • https://s3.amazonaws.com/zemigiduwagafu/macbeth_act_1_scene_2_questions_and_answers.pdf
    • https://s3.amazonaws.com/kisimujuk/48544898278.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c47e.bin
b18977457cd41db4b0fdbdd7f564edd720a32889895c5fee06d43b80397c87d4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC47E 4620 bytes
font_01_sfnt_off0000d450.bin
027fcc74edde695263e95d0321967635cdaa3c4dd0662464fc1b722c1effde34		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD450 10480 bytes

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