Malicious PDF — malware analysis report

Static analysis result for SHA-256 4507feb77c58f047…

MALICIOUS

PDF

79.6 KB Created: 2021-04-09 19:03:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 292e79349ad3d44cb5be20e98ee01759 SHA-1: 6e84a9f1d5c822b8c303a58d5122b6914cf429f7 SHA-256: 4507feb77c58f04704b31eb5288a70a4abb91276580e6ba3cfde8c469f6e907d
186 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 hosted on disposable domains, indicating a link farm or phishing attempt. The primary malicious URL identified is https://vilenefex.ru/strik, which is likely used to redirect users to further malicious content. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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://vilenefex.ru/strik?utm_term=l%2527art+de+la+guerre+sun+tzu+avis PDF link annotation
    • http://flylovel.com/6502729362407975.pdfIn PDF document text
    • https://fogakorix.weebly.com/uploads/1/3/3/9/133997140/kakujadudonut-pubuzas-fifaluvor.pdfIn PDF document text
    • http://teplotronic.ru/255346500697o6v7.pdfIn PDF document text
    • https://zububeto.weebly.com/uploads/1/3/6/0/136082076/ronozel-zamibabe-dupivur.pdfIn PDF document text
    • https://belexikezetuvom.weebly.com/uploads/1/3/0/7/130775063/8765275.pdfIn PDF document text
    • https://sutopudebesi.weebly.com/uploads/1/3/1/4/131438093/vugajejojub.pdfIn PDF document text
    • http://wexypay.icu/6_7_8_9_times_tables_worksheetsizjka.pdfIn PDF document text
    • https://cdn.sqhk.co/loxexafetivu/a9haBpX/7672429894.pdfIn PDF document text
    • https://cdn.sqhk.co/zofizitene/B3wigif/15340202671.pdfIn PDF document text
    • http://qrastenmap.online/small_instagram_logo_for_business_cardl5lte.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://b5d51143-f34a-4a4f-9265-6917490cb775.filesusr.com/ugd/9f69bd_61a5524c7e854adcad356d2f12996f85.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f0b3bfd0-9c8b-47c8-9e38-1d4a5fc057bb/nebanuwigagumujizo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a7133d78-b543-46cd-8bf0-3e44d37d0c94/popatirusuvabel.pdfIn PDF document text
    • https://eee5dff6-7331-416e-acdf-593d0c386862.filesusr.com/ugd/21e9e0_7879b8b77eff4cc7a73933d728f8b012.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/de743adc-c2d8-48ef-8ec2-c958ab9b5240/wevewaronigasobupevenap.pdfIn PDF document text
    • http://xeregolipota.epizy.com/apps_facebook_lite_apk.pdfIn PDF document text
    • http://tukorokibenej.epizy.com/samsung_galaxy_a10e_unlocked_amazon.pdfIn PDF document text
    • http://lesexugisitu.rf.gd/1942306725.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_off0000f744.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF744 5076 bytes
SHA-256: c4bd161138f5aeda5b985526f684d4dd689a7b89cf2af2b4af218cb053efe9bd
font_01_sfnt_off000108b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108B0 12508 bytes
SHA-256: 503b0e94cee1a7d3a8d091b6a070f113c3a5ed7decbc1fcceb4ed34f119c5eae

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