Malicious PDF — malware analysis report

Static analysis result for SHA-256 12b8ac7554eaf5f2…

MALICIOUS

PDF

80.6 KB Created: 2020-12-24 20:29:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0b22b6d69181f88a63e7534aff2fabe3 SHA-1: 710a4972915cacd05e10510a125c23829f2dcf2c SHA-256: 12b8ac7554eaf5f2dd378968a87580342276efabdbe80a5bc27277a01be34019
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of a PDF link farm heuristic suggests the document is designed to redirect users to numerous external URLs, potentially for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and external links are indicative of a malicious document, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://traffset.ru/123?utm_term=filthy+frank+2013
    • https://cdn-cms.f-static.net/uploads/4366381/normal_5f8744621bbc5.pdf
    • https://fupesovuzej.weebly.com/uploads/1/3/4/0/134016868/duponarivopal-lusozaj-ritanu-momurokob.pdf
    • https://cdn-cms.f-static.net/uploads/4389805/normal_5fa0bc51765ab.pdf
    • https://cdn.sqhk.co/wupifufexix/fjqhaiY/12642058491.pdf
    • https://cdn.sqhk.co/gaxumisi/gghhQjc/vojikurotabuj.pdf
    • https://cdn.sqhk.co/berovanova/CgXxNie/lefodurilobadux.pdf
    • https://gorixiboxizamo.weebly.com/uploads/1/3/4/5/134589430/nazodira_vawaxibu.pdf
    • https://cdn-cms.f-static.net/uploads/4409403/normal_5f99ac15efdf6.pdf
    • https://cdn.sqhk.co/lasesekov/dhh1M1A/rust_camera_commands.pdf
    • https://cdn.sqhk.co/kapopajij/iiibjXv/groove_coaster_2_download_pc.pdf
    • https://static.s123-cdn-static.com/uploads/4497079/normal_5fe09788878f2.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/nakuzafol/1891627317.pdf
    • https://s3.amazonaws.com/paropabaru/ruxom.pdf
    • https://s3.amazonaws.com/jivuxo/everything_everything_book_free_download.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0f7.bin
f7ba6c4bf867a1ff34f7d954574c3ef48dbb0d7d6f441a68739cc4cbb6c3b9ac
pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F7 3824 bytes
font_01_sfnt_off0000fe9b.bin
82ade61485575f4a66bc9ac0eb367c9fed86cb2929c56a7224b874aaa77daa33
pdf-font-stream PDF embedded font (sfnt) at offset 0xFE9B 5288 bytes
font_02_sfnt_off000110a0.bin
2ccea87ee717cbe651ecb6eb9163dda6039b85b54267a867c8962fe2b04f3bf3
pdf-font-stream PDF embedded font (sfnt) at offset 0x110A0 10700 bytes