Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1eb72840812c0d9…

MALICIOUS

PDF

68.2 KB Created: 2020-12-18 05:28:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7a11d3aa72f08840445b41380cd1ac9b SHA-1: eedc94ee0712eae0a6a1c275fc15a99a12eeedfb SHA-256: b1eb72840812c0d9545f73c7088296f17065c262fd26c3df8ae27601b901320e
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with one prominent URL leading to a suspicious domain that appears to be part of a link farm. The document body, though heavily obfuscated, contains text related to 'touchgrind skate 2 all maps apk', suggesting a lure to download a modified game. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://trafficel.ru/strik?utm_term=touchgrind+skate+2+all+maps+apk
    • https://dowisapi.weebly.com/uploads/1/3/4/2/134266119/381216.pdf
    • https://kuromazu.weebly.com/uploads/1/3/2/6/132695519/7407ecd269a.pdf
    • https://bivesazi.weebly.com/uploads/1/3/4/6/134652180/sewudanajolapabub.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/9c8a9385-1fc1-4f77-a04c-ee1a19a44ef5/96871437053.pdf
    • https://uploads.strikinglycdn.com/files/75c611d3-62ec-44fe-b189-f8a4b3acdec8/72405665967.pdf
    • https://s3.amazonaws.com/lomiwexuva/best_ebook_reader_for_books.pdf
    • https://s3.amazonaws.com/dogazisuze/code_geass_mary_bell.pdf
    • https://static1.squarespace.com/static/5fc11e8e16f6d44b07c01948/t/5fc38203a97599144e65105a/1606648324802/49560832993.pdf
    • https://static1.squarespace.com/static/5fc0e844cd1e280355d45049/t/5fc680c6f3de5e49b546e35e/1606844615205/6713804736.pdf
    • https://s3.amazonaws.com/zobuwubedak/my_pltw_1.1.5_answer_key.pdf
    • https://uploads.strikinglycdn.com/files/3c45f878-d4a8-4658-9520-e86ce652b243/the_zte_zmax_pro.pdf
    • https://s3.amazonaws.com/dutuzanob/75332011383.pdf
    • https://s3.amazonaws.com/medaliwifufugel/timeline_design_template.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_off0000cbc7.bin
8151256a6814a11735d3b270239467034fddea9c0d9823b5eed3e25ddd308ff8
pdf-font-stream PDF embedded font (sfnt) at offset 0xCBC7 5632 bytes
font_01_sfnt_off0000dec6.bin
51c4bd8557b8e01ba54dcc8b267961d84e50e238e387e57ea297694416cd805a
pdf-font-stream PDF embedded font (sfnt) at offset 0xDEC6 10436 bytes