Malicious PDF — malware analysis report

Static analysis result for SHA-256 31fa43167ae9c43c…

MALICIOUS

PDF

85.7 KB Created: 2021-03-22 13:03:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 6a235959eb5592195496281e2e79fa01 SHA-1: eaa07c2923d1af0656248c31d0b310eede2704b4 SHA-256: 31fa43167ae9c43ced657c8e0a9dcc05ec947ac066f106b4d51a2d4882330d83
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many pointing to disposable domains, and is flagged by ML classifiers and ClamAV as malicious. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a link farm on potentially untrusted hosting. While no scripts were explicitly extracted, the presence of external URIs and the overall detection suggest the document is designed to redirect users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 5

  • 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 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://jumiwimov.ru/123?utm_term=andy%2527+s+menu+nutritional+information PDF link annotation
    • http://lufexaxoxak.mygamesonline.org/arang_aktif_tempurung_kelapa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389570/normal_5febb08b648b1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476133/normal_5fe2b72be6d4a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447085/normal_5fdb548d2ad49.pdfIn PDF document text
    • https://cdn.sqhk.co/gotulurowav/biekhh4/reniroraminupufo.pdfIn PDF document text
    • https://cdn.sqhk.co/dinigivo/cVAy0Jr/commander_cody_bandai.pdfIn PDF document text
    • https://cdn.sqhk.co/vabedesi/hifhgz2/smart_internet_prepaid_promo_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/lunexubafexo/iDujhhj/83499536622.pdfIn PDF document text
    • https://cdn.sqhk.co/pivokazi/prw4gjF/xovakofagowuno.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466661/normal_5fee370e45e6f.pdfIn PDF document text
    • http://dufifudusimube.mygamesonline.org/sibigiwovivinumepu.pdfIn PDF document text
    • https://cdn.sqhk.co/jitolado/himArcB/jazoxoruferug.pdfIn PDF document text
    • https://cdn.sqhk.co/gebemiwisero/KvrUZhc/29953313608.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366365/normal_6037f15aa0bb7.pdfIn PDF document text
    • http://zumufufup.sportsontheweb.net/kifux.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459794/normal_5fe5d8b8f3b26.pdfIn PDF document text
    • http://femonejigajape.mywebcommunity.org/worship_songs_lyrics_chords.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370275/normal_5fd6ccff6e4c5.pdfIn PDF document text
    • https://cdn.sqhk.co/sukonazukuv/d0fhahd/free_full_romantic_comedy_movies_on_youtube.pdfIn PDF document text
    • http://muvepifare.mygamesonline.org/secrets_of_the_temple_slot.pdfIn PDF document text
    • https://cdn.sqhk.co/kawonidoza/cgfjhhg/xurefifofuwazibev.pdfIn PDF document text
    • http://motozed.scienceontheweb.net/ddi_assessment_test_answers.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kuxemozoxabonag.onlinewebshop.net/python_dictionary_comprehension.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_off000110ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110AE 5176 bytes
SHA-256: 51adb7f1c727d84394b602aabbe04b7e3d7451f765d65bdfe896c1d7f4227e4e
font_01_sfnt_off00012241.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12241 11540 bytes
SHA-256: d19163a97cb15c69ecf08cbb6b9b7087e93f29c4cf8f1ddcbd21e2670d3dcd36

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