Malicious PDF — malware analysis report

Static analysis result for SHA-256 79d27e3300df0357…

MALICIOUS

PDF

75.7 KB Created: 2021-02-15 16:54:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 73907253f2f3f22a847f3077f2c5c6b3 SHA-1: a64ab6fbe99cc3844a5c825976d8a6bd6e3ae7ec SHA-256: 79d27e3300df0357fe982f929beadc77ea136b870803adcff5459fcd88be8479
186 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many pointing to disposable domains, suggesting a link farm or SEO spam operation. The embedded URL 'https://bologen.ru/strik?utm_term=are+all+watch+straps+interchangeable' indicates a lure to a page designed to attract traffic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via the link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://bologen.ru/strik?utm_term=are+all+watch+straps+interchangeable PDF link annotation
    • https://tavulejitozusol.weebly.com/uploads/1/3/0/8/130873759/6368801.pdfIn PDF document text
    • http://nokexukuzifuv.22web.org/35560941454.pdfIn PDF document text
    • https://tozikogok.weebly.com/uploads/1/3/5/3/135330875/niduvujikejamuditipi.pdfIn PDF document text
    • https://xapotitiguwux.weebly.com/uploads/1/3/4/6/134668809/3f491b16c54fe.pdfIn PDF document text
    • https://cdn.sqhk.co/levuzivanu/alPNQqP/reuters_news_service_wikipedia.pdfIn PDF document text
    • https://cdn.sqhk.co/fezemepusap/oihgcjf/wusezarikoji.pdfIn PDF document text
    • https://zepitobazelaki.weebly.com/uploads/1/3/4/6/134619491/xesoxapurevosus_remibup_witobegeroj.pdfIn PDF document text
    • https://telidububiz.weebly.com/uploads/1/3/1/4/131452987/mosarinop.pdfIn PDF document text
    • https://bewevirat.weebly.com/uploads/1/3/1/4/131437926/magigadovuxelit_sofoso_luwafokegin_rodufazomarenab.pdfIn PDF document text
    • https://mizijuwewis.weebly.com/uploads/1/3/4/3/134392366/zutowugifowimum_jurar.pdfIn PDF document text
    • https://ralixuviromod.weebly.com/uploads/1/3/5/3/135345966/6755738.pdfIn PDF document text
    • https://lemorixumo.weebly.com/uploads/1/3/4/7/134748879/bfd4ce3d3c70d.pdfIn PDF document text
    • https://befomunuduti.weebly.com/uploads/1/3/1/1/131164266/5681695.pdfIn PDF document text
    • https://wujipiledulom.weebly.com/uploads/1/3/4/6/134695719/fff9f80cf21c3d0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/dorulusof/gusozilasibokaseliwez.pdfIn PDF document text
    • https://s3.amazonaws.com/genukopapovixo/xajinibapuxesesipadawawov.pdfIn PDF document text
    • http://begokev.epizy.com/sound_effect_ringtone_2019.pdfIn PDF document text
    • http://zaxukesaludu.epizy.com/kussum_koilash_new_assamese_song_2019.pdfIn PDF document text
    • http://wuduzinemaz.rf.gd/88469979029.pdfIn PDF document text
    • https://s3.amazonaws.com/fejififimaketo/market_leader_intermediate_answer_key_unit_2.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC52 5416 bytes
SHA-256: ac7504c4b6c97f9cac79fb327e9bcb48ecb93b0b963d9175c32193d518a073e3
font_01_sfnt_off0000fec8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEC8 10176 bytes
SHA-256: 3475ec4117da587ebcd6dff8690756f1b45a2a60a9d9e66bc20b3031b5ed9f67

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