Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bf39b3d49943f1b…

MALICIOUS

PDF

85.2 KB Created: 2021-03-21 23:23:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: c729ed7eca8046e9b3d604c82a7a640e SHA-1: 9ee7c0cf50d8cdf6013a5ad1022e0e7955bd3208 SHA-256: 9bf39b3d49943f1b23b2f862fc3cb63d9f8c82c0ff24b4d54cc988764b88acf4
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9996

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://golowaki.ru/strik?utm_term=indirect+bandgap+vs+direct+band+gap PDF link annotation
    • https://vidozalenaw.weebly.com/uploads/1/3/4/8/134875831/2675421.pdfIn PDF document text
    • http://delojenopow.66ghz.com/19816526869.pdfIn PDF document text
    • http://formulamoney.top/77716622331a8u48.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4529893/normal_600a449b23c0a.pdfIn PDF document text
    • https://kaxawoxo.weebly.com/uploads/1/3/1/0/131070710/2361329.pdfIn PDF document text
    • https://ruvudiroxutorag.weebly.com/uploads/1/3/0/7/130775702/1a8cc31757.pdfIn PDF document text
    • http://steblin.pro/the_physiology_coloring_bookxzo4c.pdfIn PDF document text
    • https://boliminukedakos.weebly.com/uploads/1/3/4/4/134494229/wesotez-tedubusijesa-muzaz-zemakegojunu.pdfIn PDF document text
    • https://bitivomo.weebly.com/uploads/1/3/4/4/134478942/dotolere.pdfIn PDF document text
    • https://vataripisak.weebly.com/uploads/1/3/4/6/134600115/2721606.pdfIn PDF document text
    • https://paladagaludoke.weebly.com/uploads/1/3/4/4/134460366/4a4a142d.pdfIn PDF document text
    • https://pizanege.weebly.com/uploads/1/3/5/3/135391653/nibifixotuzur-wusilofike-bodomobeni.pdfIn PDF document text
    • https://zasevolonuto.weebly.com/uploads/1/3/5/3/135335071/misulubajotubose.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390638/normal_601b706a4f2a4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vabagez.rf.gd/vidmate_2018_app_for_pc.pdfIn PDF document text
    • http://fuzakumadobujav.epizy.com/buronatepab.pdfIn PDF document text
    • https://s3.amazonaws.com/gomaxod/14325126018.pdfIn PDF document text
    • https://s3.amazonaws.com/fobupojowojon/epic_7_selective_summon_guide.pdfIn PDF document text
    • http://genezifovijewi.epizy.com/setup_atem_production_studio_4k.pdfIn PDF document text
    • https://s3.amazonaws.com/xilasisefi/telifive.pdfIn PDF document text
    • https://s3.amazonaws.com/xoxaneral/83541358502.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f371.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF371 5344 bytes
SHA-256: d526fe8dc5c5aa9b6b2c8b2e2205ff59dc33c4da04204f9eaf475fa1b053e227
font_01_sfnt_off000105ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105AE 12140 bytes
SHA-256: cb636af53cb12a30ecff179c5a89e328e801ba57660c79f8c03fd167ea008fab
font_02_sfnt_off00012f52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F52 16388 bytes
SHA-256: 6e1c94f3b89a0d87713c7b4febdc42cceb0c9cb3fee169d75ad804cda1294f66

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