Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cc77fe6ea630a6d…

MALICIOUS

PDF

133.0 KB Created: 2020-12-21 03:41:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d88551e836b188408f40e4fa45c3db38 SHA-1: 4ee22fc7d1d44a3963347e3d98d2a3b50f68b0bb SHA-256: 3cc77fe6ea630a6d7366206f747f80d10c27fac793b728454f6cd6a7d4eb7463
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It contains a large number of external links, many of which are likely part of a link farm designed to direct users to malicious sites. The document body, though heavily obfuscated, appears to be a lure related to job searches, aiming to trick users into clicking on the embedded malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://trafftec.ru/strik?utm_term=field+hockey+coaching+jobs+near+me
    • https://babikovinemixe.weebly.com/uploads/1/3/1/8/131856339/fapolurefo-dubofibojarotof-kezefenobudijix.pdf
    • https://gonotelavekufuf.weebly.com/uploads/1/3/4/6/134615299/7677772.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static1.squarespace.com/static/5fc118f0bdb33045eec37880/t/5fc5915c3c6ccf69f31e13f4/1606783325666/copeland_discus_compressor_manual.pdf
    • https://s3.amazonaws.com/bepukuba/west_point_elementary_school_ga.pdf
    • https://uploads.strikinglycdn.com/files/51b1081f-9949-498b-8bff-ec30752968ab/17492852373.pdf
    • https://uploads.strikinglycdn.com/files/0148123d-8a7a-4868-89df-4aa3c14465b5/sititakefipezuxiru.pdf
    • https://static1.squarespace.com/static/5fc11628df132613bbbed3cd/t/5fce672b83d2ac65cc48cfb7/1607362348321/punch_boxing_3d_apk_free_download.pdf
    • https://uploads.strikinglycdn.com/files/be12c9c7-d880-4474-9835-aae516d18e88/el_aposento_alto.pdf
    • https://uploads.strikinglycdn.com/files/f4778932-a863-42b1-8f92-da6b9835258d/zolubore.pdf
    • https://uploads.strikinglycdn.com/files/565dddfb-18d8-4644-b05d-679d5b1c54d2/laxubupivipil.pdf
    • https://s3.amazonaws.com/vaxebisapesi/resp_educational_assistance.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001c9ea.bin
901e1470a4ef864f99d73d290bcf1d78cbc2008ac5071e6a55cf65e10e88da54
pdf-font-stream PDF embedded font (sfnt) at offset 0x1C9EA 5688 bytes
font_01_sfnt_off0001dd21.bin
15849105993c09714f832e14c8aaae78530ef137cb06d35456081fcf82edb67c
pdf-font-stream PDF embedded font (sfnt) at offset 0x1DD21 12324 bytes