Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a8ddce9c6e718aa…

MALICIOUS

PDF

80.9 KB Created: 2021-02-27 03:02:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 7f9576118e1978d4b93365e86ce38634 SHA-1: 85fd6fdfe11989b06937466822375428321e8251 SHA-256: 3a8ddce9c6e718aa8265132be59de40b19ff4518e948290f933f2dd7c76d76a7
126 Risk Score

Malware Insights

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

The PDF file contains multiple embedded URLs, with the primary one being https://midufefew.ru/aws?utm_term=world+war+1+activities+high+school+pdf, suggesting a phishing or redirection attempt. Heuristics indicate the PDF is a link farm hosted on disposable domains, and ML classifiers and ClamAV strongly flag it as malicious. The document body, though heavily obfuscated, appears to be a lure related to search terms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://midufefew.ru/aws?utm_term=world+war+1+activities+high+school+pdf PDF link annotation
    • http://luminar3-download.xyz/canon_sx700_hs_price_philippinesbip3l.pdfIn PDF document text
    • https://cdn.sqhk.co/jekunesoru/SicRidw/like_a_boss_movie_release_date_canada.pdfIn PDF document text
    • http://jinevul.mygamesonline.org/rodivegixaxajomodewa.pdfIn PDF document text
    • http://poxumanavofeboz.scienceontheweb.net/garmin_nuvi_2595lmt_sd_card.pdfIn PDF document text
    • https://kijujiwovijuk.weebly.com/uploads/1/3/1/4/131453096/6847350.pdfIn PDF document text
    • http://fapseo.ru/free_instagram_followers_and_likes9a9qd.pdfIn PDF document text
    • http://callup.today/phdre_acte_4_scne_6akcg1.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://tazafira.epizy.com/wewitudipin.pdfIn PDF document text
    • http://dasobiviwadodaj.atwebpages.com/the_crown_cast_change_season_5.pdfIn PDF document text
    • http://gigajavegofuzok.rf.gd/majijubinosimozi.pdfIn PDF document text
    • http://jikafazasakojob.epizy.com/velatufafabejom.pdfIn PDF document text
    • https://s3.amazonaws.com/fexuror/50206853258.pdfIn PDF document text
    • http://bejopobu.epizy.com/hernia_inguinal_en_nios.pdfIn PDF document text
    • http://vujuvisesakok.myartsonline.com/biwiwoforuvujepilepare.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_off0000f1c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C0 5316 bytes
SHA-256: 6d2bc6707c72cd8f16a1c11b0cc8a002fcbba419fa788bfecec7fef0869be5a1
font_01_sfnt_off00010415.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10415 10648 bytes
SHA-256: 005516a51d1c96101f07172775f287b090697ac212a645ee35d388bc31d150ac
font_02_sfnt_off0001284a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1284A 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3