Malicious PDF — malware analysis report

Static analysis result for SHA-256 75fb99c0333c574a…

MALICIOUS

PDF

62.5 KB Created: 2021-02-09 17:17:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: ed368a315f33dabf3d74fe343d61c35a SHA-1: 9735384df50f61e7015ef5108d9ec4d54d162fa1 SHA-256: 75fb99c0333c574ad478f4baf745cd69813e6f7642fc02dd579346dba732e0bd
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. It contains numerous embedded URLs, with one specifically identified as a link farm on disposable hosting, suggesting an attempt to redirect users to malicious sites. The presence of external URIs and the overall structure point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://maypoin.ru/aws?utm_term=bhakti+ringtone++pagalworld PDF link annotation
    • https://cdn.sqhk.co/birenejar/jfgfhez/pixel_gun_3d_mod_apk_2020_ios.pdfIn PDF document text
    • https://cdn.sqhk.co/dodufiruw/ajisL9p/dungeon_defenders_2_guide.pdfIn PDF document text
    • https://cdn.sqhk.co/wugunifikezu/M07TBjb/tik_tok_videos_telugu_comedy_2020.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474978/normal_5ff32b8982097.pdfIn PDF document text
    • http://santaparker.store/minecraft_pe_seed_kodlarq3f8j.pdfIn PDF document text
    • https://nufewaxitobazat.weebly.com/uploads/1/3/4/7/134748461/sezebif_rosikobu_boniw.pdfIn PDF document text
    • https://fisujokogawubi.weebly.com/uploads/1/3/2/7/132711991/7463378.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370740/normal_602182d8d4ca5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381320/normal_601085e77b169.pdfIn PDF document text
    • https://tivelagazevuw.weebly.com/uploads/1/3/4/1/134131505/mipuvizuvixobef.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/kudufigunabi/journey_builder_templates.pdfIn PDF document text
    • https://s3.amazonaws.com/lusabifef/bobasugiporodipusavu.pdfIn PDF document text
    • https://s3.amazonaws.com/penale/53656843390.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_off0000b556.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB556 5248 bytes
SHA-256: 67c08af3ff9579222fb58094b9b33b8d972acdcbefa733afb95126586fc9e7f0
font_01_sfnt_off0000c742.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC742 11500 bytes
SHA-256: f7a014ac986c7a7459d4e91193e9a6a4f03f20ddee380cab353ece92b1903920

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