Malicious PDF — malware analysis report

Static analysis result for SHA-256 83bcc21c2544e970…

MALICIOUS

PDF

78.7 KB Created: 2021-04-23 23:32:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 449eb355d68277c4f4cbc8bf06c4ea56 SHA-1: 2fea2a2a40b51bc8d952687e17f7517fc15284dd SHA-256: 83bcc21c2544e970df97bb9d206950919861d5b0c644d89f926c88d15040461b
156 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many of which are likely part of a link farm designed to manipulate search engine results or direct users to malicious content. The primary malicious URL identified is https://botokaw.ru/strik?utm_term=dell+latitude+d820+laptop+battery, which appears to be a lure for a phishing or scam campaign. The presence of numerous PDF_SEO_LINK_FARM heuristics and the ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://botokaw.ru/strik?utm_term=dell+latitude+d820+laptop+battery
    • https://static.s123-cdn-static.com/uploads/4368487/normal_5fdd41eea2680.pdf
    • http://xorabawik.medianewsonline.com/govexotejo.pdf
    • http://bitunowaluf.sportsontheweb.net/35129154474.pdf
    • https://cdn.sqhk.co/vimerokil/hhvidij/69330402160.pdf
    • https://cdn.sqhk.co/komiburufezo/hJ7difZ/piriformis_muscle_strain_mri.pdf
    • https://cdn-cms.f-static.net/uploads/4403954/normal_5fd7792d027fc.pdf
    • https://cdn-cms.f-static.net/uploads/4366044/normal_605af4189b7b1.pdf
    • http://beviluxenumiliv.mywebcommunity.org/active_learning_vs_passive_learning.pdf
    • http://fuvisetitisenon.mypressonline.com/ehtelam_ki_dua.pdf
    • https://cdn.sqhk.co/lixejudazeza/cja4Djv/fukuximetatisedeju.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://ecab545c-19d2-4654-b6ac-fb8b9749f5ba.filesusr.com/ugd/e5412a_12f77673d44a4430948f7272bac08e54.pdf?index=true
    • https://16fd3b15-5541-4454-9538-28daacbf497e.filesusr.com/ugd/e32576_a540c1edc0b04083b917ea5be9f48303.pdf?index=true
    • https://35e1cc1d-5f6c-4a41-9b1b-b9ae8dddc97a.filesusr.com/ugd/351eee_2239e14add784b45aace2d0c8fa17ba3.pdf?index=true
    • http://xepuzakudera.atwebpages.com/electrical_foreman_job_description.pdf
    • https://87d5e434-dc39-4d64-8681-877d64e204d5.filesusr.com/ugd/5660ac_f1228fb385ec4f9194dd89fa34601497.pdf?index=true
    • https://75a697d3-84f0-44cf-bab9-f05e37020c50.filesusr.com/ugd/7c3584_31b53ab5e5d742cbba1107ddb90f160a.pdf?index=true
    • https://fa202315-5cd5-4006-9a99-7c5d4406650e.filesusr.com/ugd/61804c_2ef4311c80ce4be09598c0ee7a576e7b.pdf?index=true
    • https://eaa62ee9-779c-4a2d-9f50-6c66b019a99c.filesusr.com/ugd/1cc777_ad0429038cc54ea3be3008aa68ec07cf.pdf?index=true
    • https://s3.amazonaws.com/perurulexi/tazavekor.pdf
    • https://s3.amazonaws.com/ponivotigegepub/boxing_game_softonic.pdf
    • https://s3.amazonaws.com/sonutopexaramuf/how_to_put_standard_form_to_vertex_form.pdf
    • https://57e596f1-a2cf-4e3c-9ba9-dc8e42e7d639.filesusr.com/ugd/1e1da7_9b35665a32044361904e7578ab603f65.pdf?index=true
    • https://f405dec1-7f90-4f4c-a861-5286f67d0127.filesusr.com/ugd/ab922d_2540bca703a54ca0ab1650ba8be8216b.pdf?index=true
    • https://s3.amazonaws.com/ladiwuzetawedi/immunity_against_parasitic_diseases.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_off0000f250.bin
a1e073a26858feed3d4f90f2a2f5ca757049a283c5df065c7bba58320fdad884		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF250 5484 bytes
font_01_sfnt_off00010507.bin
35cce1a74e12b0154c06201d8c186943fce5c79bbc960481c63aa7ec54734ec7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10507 12816 bytes

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