Malicious PDF — malware analysis report

Static analysis result for SHA-256 903b755f243a458f…

MALICIOUS

PDF

67.0 KB Created: 2020-11-21 03:45:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 6678f2696d27d03ab974a75b26d7819c SHA-1: dd823efff4f17101622c969b9429b9dd3ec964b4 SHA-256: 903b755f243a458f323a8b7fb2d08bb765f05717b1e544bdfe1c4b65f3afa9c9
176 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains a heuristic indicating a callback phishing lure, suggesting the document is designed to trick users into calling a fraudulent number. It also contains numerous external links, with one pointing to a PDF link farm, indicating a potential SEO poisoning or spamming campaign. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or a trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://trafficel.ru/123?utm_term=republic+metals+corporation+silver+rounds PDF link annotation
    • https://laguvibokabab.weebly.com/uploads/1/3/4/3/134383318/36144cdb04.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463264/normal_5fa59482e0e3d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376099/normal_5f99ddfe7d1cb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367927/normal_5f875cb9a99bb.pdfIn PDF document text
    • https://gewosawoma.weebly.com/uploads/1/3/0/7/130739201/9947158b656.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383695/normal_5f8fcef8402be.pdfIn PDF document text
    • https://sewolozifoguge.weebly.com/uploads/1/3/4/2/134235266/995e5897cbd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409623/normal_5fb85d5b635c4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366652/normal_5f893a80169a2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369183/normal_5fb2e40f5a153.pdfIn PDF document text
    • https://tiruzezisuwef.weebly.com/uploads/1/3/4/4/134499189/1344590.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383467/normal_5fa885fdba23c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387226/normal_5f91cbdb350b3.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/ca515c65-beef-4271-bc12-95d1cacabf08/ganomowowisudis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6fbf02e5-d7e3-451f-a3bf-999d5f51f66f/72733115418.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1004e7e6-f8c9-4f03-a51d-86c2f0c5b70c/philip_kotler_marketing_book_latest_edition.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ca89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA89 5428 bytes
SHA-256: 941c130b3bed7f38c2f3e682c8fab802e8c1c2054f7afaaab26977a47011ed3e
font_01_sfnt_off0000dce3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCE3 10044 bytes
SHA-256: e02f804aabbc775ad011243204cb7e2d19dae8ff695de667ad29252c476efa67

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