Malicious PDF — malware analysis report

Static analysis result for SHA-256 257b73df7b600673…

MALICIOUS

PDF

67.4 KB Created: 2020-12-14 23:02:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 5d5ffd00fcba9fc1174b7cc9bac19b5a SHA-1: b43fc79c4e970f18e598f8f4e25d1fa9721829d3 SHA-256: 257b73df7b6006731ce1c0c5596813880ff7628cb332538b5f93fd64e874aaa9
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file is a PDF that contains an embedded URI pointing to a suspicious domain, likely intended to redirect the user to a malicious site. Heuristics indicate a link farm and ClamAV detection confirms it as a phishing-related trojan. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to deliver a malicious payload or phish for credentials.

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://trafficel.ru/123?utm_term=funnyhouse+of+a+negro+play+pdf PDF link annotation
    • https://meribukefola.weebly.com/uploads/1/3/4/3/134314312/9729756.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366973/normal_5f87f863d63cf.pdfIn PDF document text
    • https://ludexibof.weebly.com/uploads/1/3/4/6/134638297/mamewakivija_marefu_rezamijol.pdfIn PDF document text
    • https://viferoxabuged.weebly.com/uploads/1/3/4/2/134235394/jaloliv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388274/normal_5fd2c7bfb0e5c.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/1627b099-90f3-4573-882c-a944cb83a6d8/64195480448.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc546b6a13a450bab114660/t/5fca65cac4224042d4788b91/1607099852251/32868144013.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbcef7672f8b574a0f2036e/1606217591499/family_feud_fast_money_rules.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f335293-362d-46a8-8422-04ebe07c56b1/vujixodevaxezevuw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d6fd70b6-34a1-4067-808a-47822b21a411/bates_guide_to_physical_examination_11th_edition_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/88404ba5-a53b-421e-8602-262abc4ce34f/killing_eve_parents_guide.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_off0000cb97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB97 5360 bytes
SHA-256: c350fef868056dec028f230d81a8e4cf8130aeedf7db8116d34526232914d243
font_01_sfnt_off0000dddb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDDB 10440 bytes
SHA-256: 2ae4ad010f22800da3226b316ae7d6800a5b36a5f411b6c27de94a9d74c8be49

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