Malicious PDF — malware analysis report

Static analysis result for SHA-256 933fdfcabd010fb5…

MALICIOUS

PDF

76.2 KB Created: 2021-04-02 01:27:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7f35fc998f491f705e945b414d96c052 SHA-1: 38d35e44240135171d8ea0391cedb7afee46cd10 SHA-256: 933fdfcabd010fb55a2e33beaa986c521ab4af9c6abeed89ce0b4eec52a1579b
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a significant number of external links, many hosted on disposable domains, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. The embedded URLs and the heuristic firings for PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM point towards a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=how+much+does+a+wolf+oven+cost
    • https://fulidozemupure.weebly.com/uploads/1/3/1/3/131384797/riwelikisas.pdf
    • http://sovozuzujujike.22web.org/nututakikuwifakuvude.pdf
    • https://xinelonaveguv.weebly.com/uploads/1/3/4/6/134606197/a521fa02f4ba6d6.pdf
    • https://tazirive.weebly.com/uploads/1/3/0/9/130969887/kulipubezem.pdf
    • https://jeputuzomum.weebly.com/uploads/1/3/1/3/131398597/b52b61a.pdf
    • http://busimaderule.mywebcommunity.org/dinafumok.pdf
    • http://tebaxedo.22web.org/introduction_to_composite_materials_design.pdf
    • http://fejukoturig.medianewsonline.com/fibepitekoz.pdf
    • https://vosafezedivoko.weebly.com/uploads/1/3/6/0/136095507/biwovunojom_tagunu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://850a36a1-966c-46c3-86ed-e15bcb5778a7.filesusr.com/ugd/ede58b_1189c4f769d5436e8bd664e3c933e4f5.pdf?index=true
    • https://s3.amazonaws.com/bifamomove/arsenal_vs_man_united_highlights.pdf
    • http://wibenuke.epizy.com/73975599421.pdf
    • https://s3.amazonaws.com/watajive/adobe_premiere_pro_cs6_tutorial_download.pdf
    • https://uploads.strikinglycdn.com/files/de755681-811c-4d4e-a65b-f436279f144d/how_to_turn_on_hp_pavilion_laptop.pdf
    • https://s3.amazonaws.com/nosepevozux/is_hearts_of_iron_iv_good.pdf
    • https://a43ab9c2-5efb-4cee-ac06-b782a0f5e207.filesusr.com/ugd/4826f5_e3f97b3d42914652ba29d023f493feaa.pdf?index=true
    • https://uploads.strikinglycdn.com/files/814a0a2b-1c13-4107-9c82-36b7d4136e83/57689575015.pdf
    • https://uploads.strikinglycdn.com/files/232ee231-90ef-4fb5-b3db-16b041bdc019/60384383493.pdf
    • http://gebogozomusedom.rf.gd/vayne_guide_9._20.pdf
    • https://2a6c20f5-091f-48b5-a5be-bf749919b1f6.filesusr.com/ugd/3794ad_2c553b60661c479699c3e033cdb62fde.pdf?index=true
    • https://8b83d164-5e56-46cc-b941-48f48810ddf3.filesusr.com/ugd/76ce43_02dff0c306574eebb1564aa2ce73716b.pdf?index=true
    • http://rupilozomu.epizy.com/fovede.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_off0000ebbc.bin
64465ed4c40c7e858e5938c3e29c98fc62bf9dcfbe0985c7262b4c89f6cec109		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEBBC 5280 bytes
font_01_sfnt_off0000fda7.bin
9fab6fa3342aec0147d78eb4e1ba8c5cb4fdb13a882babdc6007b589eb6d9d1e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFDA7 11212 bytes

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