Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ee503664434ccc2…

MALICIOUS

PDF

80.2 KB Created: 2021-06-10 12:18:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 789e9b6dbf2d2715e83b22be8091af2a SHA-1: 0a68e981101188b9def2692b36e937818c860e10 SHA-256: 7ee503664434ccc2e05afbfc590cd2bb6adb69991887f016cd3e24e10850d027
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable hosting services, indicating a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://archism.ru/pbw?utm_term=my+boy+android+roms PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4449629/normal_6038fb8f2508a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449421/normal_6020276362850.pdfIn PDF document text
    • https://buwotudotep.weebly.com/uploads/1/3/1/6/131606539/6964701.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452217/normal_606bd4b434854.pdfIn PDF document text
    • https://vadiduriku.weebly.com/uploads/1/3/4/4/134445950/8488965.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481528/normal_5fda353368a16.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410441/normal_6001ef68153f9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372723/normal_5fc82635cff80.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450519/normal_60534ba6bb41a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387711/normal_5fd676998ad7a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407733/normal_606a515fba016.pdfIn PDF document text
    • https://zokejiwiperasuk.weebly.com/uploads/1/3/4/6/134668939/bolovaxuxew.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459324/normal_606dda2d29f6e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471971/normal_600bd4c95b450.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462974/normal_606601c14ae88.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402720/normal_60526269d848b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419412/normal_6064bb325c540.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449629/normal_6032ab15357a3.pdfIn PDF document text
    • https://jakedekokobara.weebly.com/uploads/1/3/1/3/131381480/joxabebokogobi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://pesivop.pbworks.com/w/file/fetch/144634680/43928345935.pdfIn PDF document text
    • http://nozobitativi.pbworks.com/f/48927220036.pdfIn PDF document text
    • http://wabajafadi.pbworks.com/w/file/fetch/145008234/gonejaxeruxuwuraribubowir.pdfIn PDF document text
    • http://jedilukiwo.pbworks.com/f/35134964080.pdfIn PDF document text
    • http://zutaman.pbworks.com/f/minimal_lower_thirds_free.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE07 4776 bytes
SHA-256: 980c937570284bfcc57bc5af181049cf1915f7599c9333123dbfca21b8839729
font_01_sfnt_off0000fe0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE0A 11812 bytes
SHA-256: d662b22a98d4df93fc59cae346e92b41745915c7fc11a082173b7358409a4ac0
font_02_sfnt_off000123f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123F8 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e