Malicious PDF — malware analysis report

Static analysis result for SHA-256 08d563fe30dc5d1b…

MALICIOUS

PDF

67.5 KB Created: 2021-03-03 14:58:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: e28badc8ec84da1212f3c8fbea29e7ff SHA-1: 5bc3b23cdfdb4e7a3eaad53930c22350b8ff978c SHA-256: 08d563fe30dc5d1bbed53958e6b87fc2dd1a03712a23396e4e8abcd769f1e757
146 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a callback-phone (TOAD) lure. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://vilenefex.ru/123?utm_term=how+to+reset+voicemail+password+on+phone PDF link annotation
    • http://janorewaxeno.mygamesonline.org/d_and_d_character_sheet_5e.pdfIn PDF document text
    • http://gooddevice-online.com/amma_kavithai_hd_images4y6v.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406812/normal_60181b5d45274.pdfIn PDF document text
    • https://cdn.sqhk.co/kosibowo/isBQkjf/26775409022.pdfIn PDF document text
    • https://cdn.sqhk.co/dutedape/kyhbgii/my_talking_tom_2_game_download.pdfIn PDF document text
    • http://topsale.pro/ncert_political_science_book_class_11_in_hindi370fe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422147/normal_6035440a668c5.pdfIn PDF document text
    • http://show-visitor.xyz/guvizupogavorewukov74.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417033/normal_5ff8c4e945787.pdfIn PDF document text
    • http://stnold.com/what_is_the_probability_theory_in_statisticsjtg0h.pdfIn PDF document text
    • http://arfesopt.com/homelite_chainsaw_manual_43120fkjvo.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/tufitijinexu/formal_synonym_of_brought_up.pdfIn PDF document text
    • https://s3.amazonaws.com/fuwuzerijofa/arduino_workshop_sketch.pdfIn PDF document text
    • https://s3.amazonaws.com/xojafemori/xadedudinegizokovabitib.pdfIn PDF document text
    • http://wolobugoxew.myartsonline.com/marcy_diamond_elite_weight_bench_parts.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_off0000cb1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB1E 5424 bytes
SHA-256: 5e55ab5edd9ba5a563a07ac0a0ea5b465c3f59e4a5de01ffc1681cc715f05349
font_01_sfnt_off0000dd76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD76 10512 bytes
SHA-256: 62691b205d03f8132d723debd0702bdfc5d0dfa905ad027703871cfb3c185644

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