Malicious PDF — malware analysis report

Static analysis result for SHA-256 662daf1af3659a03…

MALICIOUS

PDF

73.4 KB Created: 2021-02-23 20:06:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 9c28ce0138e5587df59c00d08fc763a7 SHA-1: 5170c754204126ff00760bbde9398fd7b019207b SHA-256: 662daf1af3659a0338fb81c08df430eac756d2bb85084ec5af511b962ad40af7
186 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many hosted on disposable domains, indicating it is likely part of a link farm or phishing operation. The document body, though heavily obfuscated, suggests a lure related to chainsaw maintenance. The presence of PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics, along with ClamAV detection as Pdf.Phishing.Trojan, strongly suggests malicious intent. No scripts were extracted, but the overall structure points to a phishing or SEO manipulation attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jacksth.ru/strik?utm_term=how+to+adjust+oiler+on+stihl+ms180 PDF link annotation
    • https://feroxetisilujux.weebly.com/uploads/1/3/1/4/131409167/fa812de43066d.pdfIn PDF document text
    • https://cdn.sqhk.co/gobumavurob/b1igjii/jizilinujux.pdfIn PDF document text
    • https://cdn.sqhk.co/fekawitaxug/zKm6jeP/risk_neutral_default_probability_merton_model.pdfIn PDF document text
    • https://cdn.sqhk.co/manuguwe/P3iirHf/simon_the_sorcerer_game.pdfIn PDF document text
    • https://cdn.sqhk.co/mamevugixej/injfjgd/star_realms_online.pdfIn PDF document text
    • https://nuzosobife.weebly.com/uploads/1/3/4/7/134734795/9879350.pdfIn PDF document text
    • https://vepiniripalur.weebly.com/uploads/1/3/4/2/134235349/640500.pdfIn PDF document text
    • https://tudexabi.weebly.com/uploads/1/3/4/7/134770635/lekeretasa-ladixinujurajus-kiponadijuz-poniw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://suwuxuk.epizy.com/jegufesowuragubu.pdfIn PDF document text
    • http://tafaredos.rf.gd/word_cookies_creme_brulee_5_answers.pdfIn PDF document text
    • http://vetarobafawuk.epizy.com/purple_belt_form_taekwondo_america.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_off0000e160.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE160 5584 bytes
SHA-256: cd04466be5c3cfa17b638b0d90c213e6691416a79a94cb4def90de31f57a6b43
font_01_sfnt_off0000f445.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF445 10712 bytes
SHA-256: 7d7c13a430fed2f8b67117ac9d78106987fc8e99a8fc7b70ed9a9128e6b746dd

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