Malicious PDF — malware analysis report

Static analysis result for SHA-256 af22de2fd74af306…

MALICIOUS

PDF

98.0 KB Created: 2021-04-14 09:15:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 34b9ea69179e4c8232db687c1b3c975e SHA-1: b1f98a7adbe0f9cd4e5444e5f1a45fdf8825b778 SHA-256: af22de2fd74af30676140693b68364006f5e47a0c9f68d3f03cd1c8ea070d08b
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://soxebez.ru/strik?utm_term=what+is+neuropsychological+test+in+psychology PDF link annotation
    • https://denupadifujufo.weebly.com/uploads/1/3/0/8/130813478/bipixukeba.pdfIn PDF document text
    • http://gagefiwirimat.medianewsonline.com/39190833662.pdfIn PDF document text
    • http://vitofemegawe.getenjoyment.net/vuzawijajitusepimukirun.pdfIn PDF document text
    • https://xularidamilizal.weebly.com/uploads/1/3/4/6/134685918/164217.pdfIn PDF document text
    • https://munefetuwavebif.weebly.com/uploads/1/3/2/6/132683017/sewagirusaz.pdfIn PDF document text
    • https://cdn.sqhk.co/jugemito/gihjhhi/jovivomaposilon.pdfIn PDF document text
    • https://korexabareruwa.weebly.com/uploads/1/3/2/6/132680962/goluzedife.pdfIn PDF document text
    • https://cdn.sqhk.co/rifebonapesi/Ghfa6hi/1480744599.pdfIn PDF document text
    • http://pojapusevipuzu.mypressonline.com/53680505752.pdfIn PDF document text
    • https://cdn.sqhk.co/bebiwamulanu/jfTic1G/m._facebook._com_app.pdfIn PDF document text
    • https://viwezoluzuwa.weebly.com/uploads/1/3/4/4/134401695/0a47b1aee0387e3.pdfIn PDF document text
    • https://cdn.sqhk.co/gawagunikuw/82TfUGr/zosevizezipawilosuku.pdfIn PDF document text
    • https://bilunoxenaxu.weebly.com/uploads/1/3/4/4/134474733/5074111.pdfIn PDF document text
    • http://pusapev.scienceontheweb.net/zetibuxelotewupune.pdfIn PDF document text
    • https://cdn.sqhk.co/nugofonavuf/hbgiVDA/among_us_character_costume_inflatable.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
    • https://a819be37-316e-4347-83bc-b067fb6953c8.filesusr.com/ugd/d5662a_03f89527881f4d149a91c02e51424283.pdf?index=trueIn PDF document text
    • https://5d3a3edc-1384-4eb0-a354-174dd54c13aa.filesusr.com/ugd/7f5dc5_b6d75b33b07e4b44b86401866d761641.pdf?index=trueIn PDF document text
    • http://diruben.rf.gd/bersa_thunder_9_hc_review.pdfIn PDF document text
    • http://takumoz.epizy.com/fofejumorokab.pdfIn PDF document text
    • http://kumesebupaxat.epizy.com/hallelujah_sheet_piano.pdfIn PDF document text
    • https://9a89a7da-ede3-42eb-a537-7416be21eb2d.filesusr.com/ugd/aaaf79_6ddc12d933c244e7a5cfc435b07f8979.pdf?index=trueIn PDF document text
    • http://wevikokuzufos.epizy.com/banner_background_birthday.pdfIn PDF document text
    • https://314f4944-3dd9-45af-b5ee-fc7f46c963e4.filesusr.com/ugd/73cb9e_53c1eabe772646e9a0a4329a91e3ffb2.pdf?index=trueIn PDF document text
    • https://8fc1c2d6-49ba-4d63-8b95-0327ef2b1627.filesusr.com/ugd/1849a1_a3f19220855140c6b44421b030eacde9.pdf?index=trueIn 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_off000133d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133D8 5192 bytes
SHA-256: 789f2b130ee0314e0747586829136b339a2001e72c86b1e7f1578d1ec330632c
font_01_sfnt_off0001458b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1458B 11180 bytes
SHA-256: 99ad4751c6b7b596f9754a997d3dd488b72a0b423f3ce220bddc66b5f2ac8a4f
font_02_sfnt_off00016ba8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16BA8 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34