Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3db35efa04cbcfd…

MALICIOUS

PDF

73.2 KB Created: 2021-04-06 23:30:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9c93f1d7147518ea213d14d7bdd776c5 SHA-1: d49d9b774b96148a0546c4adce457661877cfa99 SHA-256: b3db35efa04cbcfdb60590af86d78d2a887e674fe63252a8bdc9b8fc732d4bc2
126 Risk Score

Malware Insights

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

The PDF contains numerous external URIs, with a critical ClamAV detection and ML classifier flagging it as malicious. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for link farms, suggesting a phishing or malware distribution attempt. The embedded URL 'https://nipisod.ru/strik?utm_term=book+of+sith+audiobook' is a primary indicator of malicious intent, likely leading to a phishing page or malware download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://nipisod.ru/strik?utm_term=book+of+sith+audiobook
    • http://myfirstsite.xyz/how_to_pass_the_arkansas_permit_test4y99o.pdf
    • http://neridofufuleteg.scienceontheweb.net/48157857233.pdf
    • http://kopaburak.sportsontheweb.net/48730402934.pdf
    • http://cleanup-sale.site/21418486843hrq7b.pdf
    • https://static.s123-cdn-static.com/uploads/4417644/normal_5ff4cc398fb13.pdf
    • https://cdn-cms.f-static.net/uploads/4445550/normal_6043b947589af.pdf
    • https://jufigewadekuxo.weebly.com/uploads/1/3/1/4/131406441/gelimadafos.pdf
    • https://static.s123-cdn-static.com/uploads/4414514/normal_5ffcdc2c2ad19.pdf
    • http://pifedalune.medianewsonline.com/40728615913.pdf
    • https://dusonomikeka.weebly.com/uploads/1/3/2/6/132695238/2305723.pdf
    • https://jokilexagazoxo.weebly.com/uploads/1/3/4/6/134602179/sateku.pdf
    • http://copyright-supporthelp.com/ranirezixaxogazivvfsur.pdf
    • http://bapatavusirave.mygamesonline.org/b._arch_syllabus_2020.pdf
    • http://uose.xyz/11398448934e418g.pdf
    • http://all-casino.xyz/air_force_one_shadow_se_spruce_auramts3h.pdf
    • https://static.s123-cdn-static.com/uploads/4448548/normal_5fee521eef2bd.pdf
    • http://frut-tree.site/1796524352i7r4j.pdf
    • http://lnstagaram-verifiedbadges-from.com/cascade_east_ride_center_bend_oregon617qu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://vilumepidiwego.myartsonline.com/jukumaxolufiladalugijutu.pdf
    • https://uploads.strikinglycdn.com/files/1fa6ce5b-5e9e-448d-8065-94acacb38c14/lyman_ar_reloading_handbook.pdf
    • https://uploads.strikinglycdn.com/files/dcfffee2-bf10-4dc2-af86-cecb7157c903/how_wide_is_a_55_samsung_tv.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e017.bin
205cc450716ee63384ef21113b3e9b8f2ebac6692e8aff2801c2193c87c206dc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE017 5120 bytes
font_01_sfnt_off0000f18a.bin
8b7c897bf270e32bb47ee049a54d27196ee89cad7dd609e5594668fbd2669aa3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF18A 11300 bytes

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