Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a2d1f81da1667f8…

MALICIOUS

PDF

65.8 KB Created: 2020-11-11 03:53:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 95d818b0e7db2f36b147ff1d854f73d8 SHA-1: 91981ac21a2a5b3210edb7264bd8fb2a511086e7 SHA-256: 4a2d1f81da1667f809fa7289aa01996f55ffe2f6ab706a79944c8c8eed8d13de
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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/strik?keyword=sun+for+the+vampire+3 PDF link annotation
    • https://porujigiwafixuf.weebly.com/uploads/1/3/4/3/134373975/7521037.pdfIn PDF document text
    • https://lorovojiwu.weebly.com/uploads/1/3/4/3/134318747/lunimeno-wizugenef-luxalelinawe.pdfIn PDF document text
    • https://kabudededawizo.weebly.com/uploads/1/3/1/3/131383409/buveviwitefobos.pdfIn PDF document text
    • https://moxoviwepikiwu.weebly.com/uploads/1/3/2/8/132814726/kedakikozadasiniget.pdfIn PDF document text
    • https://boguvetasitob.weebly.com/uploads/1/3/1/3/131380850/9979694.pdfIn PDF document text
    • https://mupibidegupek.weebly.com/uploads/1/3/0/8/130874042/3314248.pdfIn PDF document text
    • https://rumidevuj.weebly.com/uploads/1/3/4/3/134310249/mukejige-nejelawaz.pdfIn PDF document text
    • http://www.coolmath-games.com/0-the-...-the-vampire-3In 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/0f86a53b-2028-4535-bf62-e9f0d643727a/pifidenona.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/19a56c6e-9ea4-4b5b-a94d-358cd398ac9f/wutigegofolovo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/62c7a616-2317-42b5-a8a4-620d43993dda/68900374018.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/711aab95-793a-47d4-af14-b97c8b2472cf/numogegisajaxirik.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e6a633f7-d68a-40dd-ae09-f92bf07b6596/47029597617.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/98357a05-0e3a-4cca-b178-3f1ee92f20d8/18293534913.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_off0000c4eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4EB 5260 bytes
SHA-256: 3c340540385f0182a0be890727826276db02e72ff0f81c494759d1d96aa17d04
font_01_sfnt_off0000d6af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6AF 10908 bytes
SHA-256: f9ecb648feda0ea904ee8b54e9af355db5fb52862f1ae106123b37ad1de528af

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