Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca29889d4f28e6da…

MALICIOUS

PDF

73.8 KB Created: 2020-12-15 23:36:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 26c77cfbbf485c307b6eb09ab40f5154 SHA-1: 7ddcdb71c50c9289ffff1661c877d705018b8058 SHA-256: ca29889d4f28e6daa0dbf2db789221bd4f0a068b81cfc11319291c35770ddefe
174 Risk Score

Malware Insights

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

The PDF document contains a lure related to 'calorie counting worksheet' and instructs the user to enable editing, a common social engineering tactic. It embeds a link to known malicious redirector infrastructure, specifically 'https://traffmen.ru/123?utm_term=calorie+counting+worksheet', which is highly indicative of a phishing or malware distribution attempt. The ML classifier and ClamAV detection further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Macro/content-enable lure medium SE_ENABLE_LURE
    Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings
  • 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=calorie+counting+worksheet In PDF document text
    • https://cdn-cms.f-static.net/uploads/4418199/normal_5f987f7137090.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/roware/benzene_toxicity.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc165e488c99b6d37aa9f7e/t/5fc89d3dee804a17a1d5cb3c/1606982973504/traffic_rider_hack_apk_download_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d9b89cd-2e90-4328-94f7-ebcbd745cba0/vunakew.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f4abbca-df95-4a72-9cb6-7287d6aeb27c/jasawogawog.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f9ca9f00-1666-417a-ab72-543224968ccf/38022127890.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a2697aa-5b53-4c5b-bc43-0be7944c653b/zobam.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1070356f-1518-474b-9877-cde0551a2b03/mla_format_footnotes_font_size.pdfIn PDF document text
    • https://s3.amazonaws.com/zunewidimem/ielts_writing_task_1_topics_download.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0d650403f5353fd956949/t/5fd1a339ad61ab58318724c9/1607574330205/67931003904.pdfIn PDF document text
    • https://s3.amazonaws.com/voxipanovigepiv/turabukajeruxowomawimenep.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7984991-838c-4934-9d82-dfc0f1e82e39/2006_jeep_wrangler_manual_transmission_noise.pdfIn PDF document text
    • https://s3.amazonaws.com/jukezeluf/kiselasuga.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e343.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE343 5124 bytes
SHA-256: f029065c02dd9f25cf3d5db87b97e131608fc7116e819d1b63ba2eeca7888ba2
font_01_sfnt_off0000f4ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4BA 11028 bytes
SHA-256: c9acb1fa4805d67d861580224c714e31830d394c4710e3480f3cd37b4e9b96c0

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