Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f0b5caab3e14220…

MALICIOUS

PDF

77.8 KB Created: 2021-04-28 05:53:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 67e618dc3890690465b54d0abe7d5a3e SHA-1: dee640ac500172b2cb98f457d71302b0b5212a8f SHA-256: 7f0b5caab3e1422096e094b4939427bd9ad8599866a726e69a7186b8ba4e6906
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_LINK_FARM' suggests the document contains a large number of external links, likely to manipulate search engine results or direct users to phishing sites. The presence of embedded URLs further supports this, with one notable URL being https://botokaw.ru/strik. No scripts were extracted from this sample, but the overall structure points towards a phishing or SEO-based malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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=girl+boss+sophia+amoruso+vk
    • http://reduslim-eu.site/40412048840so8g5.pdf
    • https://tuboxivodase.weebly.com/uploads/1/3/4/3/134387713/60a5417e7709.pdf
    • https://faxufoxexukixel.weebly.com/uploads/1/3/4/4/134455740/kujog-wozumujoloko-jiruja.pdf
    • https://pamigewome.weebly.com/uploads/1/3/4/6/134631685/41ef04d9922f4e3.pdf
    • https://wefogazasu.weebly.com/uploads/1/3/4/8/134880183/mubud_teboririworuru_femuw.pdf
    • https://cdn.sqhk.co/kafevinuva/izXheYd/nesikelipisowutepuxonerib.pdf
    • https://masezinonorokun.weebly.com/uploads/1/3/4/6/134685416/jejef-lemimu-midotep-xugukorurir.pdf
    • https://cdn.sqhk.co/wizokawoxo/eiajcZG/ultimate_facts_did_you_know.pdf
    • https://jilolepileg.weebly.com/uploads/1/3/1/4/131453494/5623fb4f3.pdf
    • https://zogopovedizojux.weebly.com/uploads/1/3/1/4/131408172/6d803207d6.pdf
    • https://cdn.sqhk.co/mixagumidis/gh6FXjf/fabrication_of_hydraulic_pipe_bending_machine.pdf
    • http://idealica-official.website/69930359840wonrz.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://05e27880-d5e1-4d3d-8428-ba943e9300bc.filesusr.com/ugd/b56239_5549904c22a44a9897a4f5cae09f92dc.pdf?index=true
    • https://s3.amazonaws.com/vuraradaso/que_es_el_brainstorming.pdf
    • https://s3.amazonaws.com/risisipajole/59569785199.pdf
    • https://748e6e98-33e2-4bd1-95aa-01ea3505a154.filesusr.com/ugd/704f6c_3125785bcb914d749cb3382a360987c7.pdf?index=true
    • https://s3.amazonaws.com/jefazaxal/bunafafokugoxelebexagiba.pdf
    • https://684917c6-b594-4497-9ea4-141105166a5b.filesusr.com/ugd/0dc9f5_543590827e4142d3b124b9e8debefc64.pdf?index=true
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e5b5.bin
ab81fa028e52a55952cc642def2a4aa95706a9364a94edda731ab55e69f13f74
pdf-font-stream PDF embedded font (sfnt) at offset 0xE5B5 4932 bytes
font_01_sfnt_off0000f66c.bin
e668c7d115640089010bf6c2fc1d39eef33dc2249b6fb646000e31ac9bf06bdf
pdf-font-stream PDF embedded font (sfnt) at offset 0xF66C 11320 bytes
font_02_sfnt_off00011c53.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378
pdf-font-stream PDF embedded font (sfnt) at offset 0x11C53 4324 bytes