Malicious PDF — malware analysis report

Static analysis result for SHA-256 74db0effa20bc083…

MALICIOUS

PDF

75.3 KB Created: 2021-04-02 02:01:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: d560365a7a59e1677a35cea4aef05202 SHA-1: bb69f56f114aca85a0e4234f139fd27bedb6e562 SHA-256: 74db0effa20bc083117720a5294f130f159ea00ff27fdcb1cdc2ebab4cd68e12
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 detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, with several pointing to disposable domains and acting as a link farm, a common tactic for distributing malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this malicious intent.

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://bologen.ru/strik?utm_term=fbv+shortboard+mkii+compatibility PDF link annotation
    • http://wotidoteked.mywebcommunity.org/what_does_the_word_punctuated_equilibrium_mean.pdfIn PDF document text
    • http://nebofonuve.mywebcommunity.org/what_is_healthier_taco_bell_or_subway.pdfIn PDF document text
    • http://zivemigidefis.mypressonline.com/86822592219.pdfIn PDF document text
    • http://zizodoroluxonaf.sportsontheweb.net/how_to_determine_which_solvent_to_use_in_recrystallization.pdfIn PDF document text
    • http://rivilidopu.medianewsonline.com/lawojiz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478669/normal_600cfdd056d51.pdfIn PDF document text
    • http://fumizudo.sportsontheweb.net/akuntansi_biaya_daljono.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368492/normal_5fcdd6516a6c2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468255/normal_605acd6b6d8b3.pdfIn PDF document text
    • http://sosuziba.mypressonline.com/pdf_text_editing_software_free_download.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://a4346b84-4611-49ab-b113-80c9188ca613.filesusr.com/ugd/078c79_90984d6ea4d94e9c82f1bd4691ec3351.pdf?index=trueIn PDF document text
    • http://jowawaba.atwebpages.com/17457981879.pdfIn PDF document text
    • https://cb6d8354-940b-4e05-9f1d-0150973ab277.filesusr.com/ugd/882da0_5d2817f7c798407497d2273b4311d5b4.pdf?index=trueIn PDF document text
    • http://suxazetevuzo.onlinewebshop.net/rudram_namakam_chamakam_lyrics.pdfIn PDF document text
    • https://ca39a19f-16f9-469f-ab0b-65ec0463b8d0.filesusr.com/ugd/cc9b97_f52e49bcb5c544529413b3f965a49383.pdf?index=trueIn PDF document text
    • https://7fca5364-97a1-4441-b76e-d2c429a59218.filesusr.com/ugd/735424_da1c2c24c99a4355b7584ff6703e42d0.pdf?index=trueIn 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_off0000e625.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE625 5632 bytes
SHA-256: 680fdd365da4c6154d5c27ea9ad13c38ffd24f0934cfd3247d61e3e9c44d877e
font_01_sfnt_off0000f92c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF92C 11700 bytes
SHA-256: aeaa49f0717351d454be9fceef9164b9ed6028e8a2003a6666858702ca5fd1d0

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