Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c9a3e880ee30d5a…

MALICIOUS

PDF

122.3 KB Created: 2021-01-08 08:49:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 8e69ccce4d4798b8baf38c1a30536a78 SHA-1: 6a7296a51b4682a27a08cb4bcb01f248c91b86d4 SHA-256: 3c9a3e880ee30d5a3f00ac6b249c91a17ced8289158313cd88f614c6a6a46d96
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate maliciousness. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics point towards an attempt to redirect users to malicious or deceptive content.

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
  • 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.
  • 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://trafffi.ru/aws?utm_term=meta+analysis+example+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4382405/normal_5f96105cbb07c.pdfIn PDF document text
    • https://vakigosem.weebly.com/uploads/1/3/4/4/134480352/zipof_morusanilapafen.pdfIn PDF document text
    • https://nunoperiv.weebly.com/uploads/1/3/1/8/131856708/dewotirolutoxik-xivid-tapewi-gemunib.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384045/normal_5fb77709e8189.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379471/normal_5fe226736e986.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378171/normal_5f94803443a7b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/2be0f387-eb30-4a4e-b98c-df9014600232/gravitational_force_worksheet_answer_key.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1649bf97-7e00-4df6-8e25-db7af89c8e0c/gixikudafut.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a7e2920-3fcf-4588-a038-f1c0b4185fd0/resistance_band_program.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/77d13a4e-797d-4316-ae64-d0e17a775a57/17062999148.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd87b6cc-ac58-4044-ae09-40b64fe00268/munafuvalaporogateda.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd75b468-d8c2-482b-9fd5-7c4745f1ccbb/azur_lane_ship_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c88bfd42-414f-4ee5-baea-31cf97402805/lupedove.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ec81106-81c7-4e57-9bde-390c36726bf4/57546066373.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001923a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1923A 4944 bytes
SHA-256: 668537b33da4ed43d21bbf12c704d5383c596f39b9729eb5fdc45c3a997e08ec
font_01_sfnt_off0001a308.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A308 12688 bytes
SHA-256: 9f79c68f10d0a8f84ffed3d468cb3162878d65dc9bda42f68b0ccebc2fdfe0fd
font_02_sfnt_off0001cd74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CD74 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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