Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff85a74b3ba322d8…

MALICIOUS

PDF

93.8 KB Created: 2021-04-30 19:15:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 0cc7d367e4baccbc8e68353cb576c184 SHA-1: 954da67a1967222f2b4580a1f0a3dd727d3f30bb SHA-256: ff85a74b3ba322d851a9528a35ca3bbbcdab4861bd76803a90ed884c23e53c8e
194 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded external links, many of which point to disposable domains, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution via these links. Although no scripts were explicitly extracted, the PDF structure and numerous URLs are indicative of a malicious workflow designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://golowaki.ru/strik?utm_term=vegetarian+shopping+list+for+beginners PDF link annotation
    • http://kawlites.online/antony_and_cleopatra_themesil1vq.pdfIn PDF document text
    • https://cdn.sqhk.co/muvetowiripa/VgeHcij/retroviruses_are_characterized_by.pdfIn PDF document text
    • http://de-bewertung-id-q2e5t23.top/how_to_remove_a_stuck_water_filter_from_a_samsung_refrigeratord85ji.pdfIn PDF document text
    • https://cdn.sqhk.co/xonoguduzob/ZCwFhjf/67518231037.pdfIn PDF document text
    • https://xujufefar.weebly.com/uploads/1/3/1/4/131483110/578878.pdfIn PDF document text
    • https://vufupobuzalezu.weebly.com/uploads/1/3/4/8/134853030/xaxorevagofutesemo.pdfIn PDF document text
    • http://gayerkan.com/what_is_the_difference_between_functional_and_strength_training021ab.pdfIn PDF document text
    • https://cdn.sqhk.co/zufuxirap/iiaieij/sujeleleduvurujugamizu.pdfIn PDF document text
    • http://zonokiwuwagupu.getenjoyment.net/sufatewe.pdfIn PDF document text
    • https://zeduxuvanoripi.weebly.com/uploads/1/3/0/7/130775880/sagazirim.pdfIn PDF document text
    • http://reduslimitalia.site/wudurokerinonih44f1.pdfIn PDF document text
    • http://zasufigonibat.getenjoyment.net/36631788143.pdfIn PDF document text
    • https://cdn.sqhk.co/tabotewo/sNgegfn/questions_and_answers.pdfIn PDF document text
    • https://pivamuwonojazop.weebly.com/uploads/1/3/0/9/130969183/suvarixov.pdfIn PDF document text
    • https://nesupopokajore.weebly.com/uploads/1/3/5/3/135394324/4813f4239b.pdfIn PDF document text
    • https://jotevalosovem.weebly.com/uploads/1/3/4/3/134385082/powexogim.pdfIn PDF document text
    • https://novazoneb.weebly.com/uploads/1/3/0/8/130814043/143207.pdfIn PDF document text
    • https://xomitemekebok.weebly.com/uploads/1/3/4/8/134881854/jugojimupororesepi.pdfIn PDF document text
    • http://gufutaca1.xyz/rulirojibefovodfvyjd.pdfIn PDF document text
    • https://posijakafit.weebly.com/uploads/1/3/5/3/135320461/tabutukubenet_dililot_dagitixojuse_wefod.pdfIn PDF document text
    • https://cdn.sqhk.co/purijiralug/jFgi2nK/jesewatolabudonijekabuji.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://zokaramizixa.atwebpages.com/5_day_workout_routine_for_beginners.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/93b2e17b-0c8b-4671-bdec-f4d0b72da5ed/64253803955.pdfIn PDF document text
    • http://lodumojokexiku.onlinewebshop.net/cavatina_deer_hunter_guitar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f851ca90-a092-4572-a407-03cd9ab042e8/tazemifevebipudiwobalo.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000122e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122E1 5056 bytes
SHA-256: ee98dce292bf22edd50e7b9e714905f7a7e7a5a0c756713cc6bc252ee4e32165
font_01_sfnt_off00013404.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13404 11464 bytes
SHA-256: 52b777fb3df9d83ccc8d5e72c99f49b84d805082328b24545b9aab97d057f468
font_02_sfnt_off00015b18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B18 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378