Malicious PDF — malware analysis report

Static analysis result for SHA-256 9152104061bf2d02…

MALICIOUS

PDF

72.1 KB Created: 2021-02-13 02:11:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: da01590b039da561fc59909dd574ff37 SHA-1: 0419d02a68ba5776ec5e7461959e2b2a08561040 SHA-256: 9152104061bf2d02c546923b7fbd78c229e61f854ce085973e0e4960c45d8823
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically as a phishing trojan. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. The embedded URLs likely lead to malicious content or phishing pages, aiming to deceive users into visiting them.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://maypoin.ru/wb?keyword=mastering%20metrics%20by%20angrist%20and%20pischke%20pdf PDF link annotation
    • https://xasigusuvenazuj.weebly.com/uploads/1/3/0/7/130739755/a95b38c27.pdfIn PDF document text
    • https://raxipova.weebly.com/uploads/1/3/4/2/134234678/c2b59e.pdfIn PDF document text
    • http://cookwellbakewell.com/minecraft_creeper_pumpkin_templatem47eg.pdfIn PDF document text
    • https://vojizozovogimum.weebly.com/uploads/1/3/0/7/130740342/0ace2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385847/normal_5fe77646ed50c.pdfIn PDF document text
    • http://swiss-gear.shop/52505274735cj9rn.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413575/normal_5fe1216e35c23.pdfIn PDF document text
    • http://volosaty100.xyz/vivubisasetirexorogarabuj13ql4.pdfIn PDF document text
    • https://xikaxuroloxo.weebly.com/uploads/1/3/1/4/131406092/380cf.pdfIn PDF document text
    • http://gebajajax.22web.org/fibuturejak.pdfIn PDF document text
    • http://rankingcoach-seo.com/p90x_ab_ripper_x_twitchtspc6.pdfIn PDF document text
    • https://ripukalogud.weebly.com/uploads/1/3/4/3/134391837/2409416.pdfIn PDF document text
    • http://hookup666.site/semanekimepopivajibuvipepg1bko.pdfIn PDF document text
    • https://fixemebipufuw.weebly.com/uploads/1/3/4/1/134131586/5485847.pdfIn PDF document text
    • http://cesaregaspari.com/hyperbole_and_a_half_book_freexwgwi.pdfIn PDF document text
    • http://extrameets.fun/anjathey_tamil_movielvmta.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://luvojidepezepag.epizy.com/android_phone_messages_on_ipad.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_off0000daf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAF6 5848 bytes
SHA-256: bbb2dd515ecfd3f376200818e29424ad67b753d02dc2e37a3fdac1b9b3b8ef26
font_01_sfnt_off0000eeca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEECA 10664 bytes
SHA-256: fccbe47fe7b2997966474ee9a4ffc63fbeb978ed4a5865ee9642c046c80e40d3

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