Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c89519496d90ff3…

MALICIOUS

PDF

72.7 KB Created: 2021-03-21 01:29:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 2a3bae6af86643f411f289d5ae7ce01d SHA-1: 5a736d237565756fb0bb4d158a1c7f96bc95137b SHA-256: 8c89519496d90ff3ab268fe0f879a3fcda8062885d6c341df34b9441a82f96c5
222 Risk Score

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. The file embeds a large number of external links characteristic of an SEO link farm, routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://yafferge.ru/123?utm_term=hori+racing+wheel+apex+user+manual In PDF document text
    • http://sweetmeet.online/piano_tiles_game_for_pc_free_downloadnobkq.pdfIn PDF document text
    • http://usersdeviceprotectionservice.site/download_naruto_moviexahyl.pdfIn PDF document text
    • http://kurs1.xyz/industrial_paper_shredding_machine_for_salecv8kc.pdfIn PDF document text
    • https://cdn.sqhk.co/xeviremal/fggsV3o/24045735259.pdfIn PDF document text
    • https://kevefizi.weebly.com/uploads/1/3/1/8/131871405/zorivovije_maxolegovenez_winawoluvitido.pdfIn PDF document text
    • https://sipexagugiresu.weebly.com/uploads/1/3/4/6/134607427/kazekitape.pdfIn PDF document text
    • https://zupudawuliwubil.weebly.com/uploads/1/3/4/2/134265939/4f951be76a5.pdfIn PDF document text
    • https://cdn.sqhk.co/salaseli/eghERgd/40599128542.pdfIn PDF document text
    • https://fiwobezamarevev.weebly.com/uploads/1/3/2/7/132740324/pomejutamib-kujozuvufijek-vakono-movupumarisoje.pdfIn PDF document text
    • http://autobuff.xyz/minn_kota_copilot_remote_programming9v1ty.pdfIn PDF document text
    • http://igcopyrightforhelps.com/6214005191sfywf.pdfIn PDF document text
    • http://rabusog.22web.org/dell_precision_m6800_repair_manual.pdfIn PDF document text
    • http://tigusomoxuwij.22web.org/grade_12_math_curriculum_guide.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
    • https://s3.amazonaws.com/sixenogafopoj/dividing_mixed_fractions_questions_and_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/zagapaxa/gaggia_classic_2020_review.pdfIn PDF document text
    • http://fufabufitilaf.epizy.com/91418735902.pdfIn PDF document text
    • https://s3.amazonaws.com/fajujiju/vector_visiting_card_design_cdr_free.pdfIn PDF document text
    • https://s3.amazonaws.com/badodemebo/15131891890.pdfIn PDF document text
    • https://s3.amazonaws.com/tanapilamaxi/is_the_chili_at_wendys_gluten_free.pdfIn PDF document text
    • https://s3.amazonaws.com/sulasatevirexo/best_2_person_soccer_drills.pdfIn PDF document text
    • https://s3.amazonaws.com/wunupalezozerud/61924749782.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_off0000d28b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD28B 5268 bytes
SHA-256: 8cb7e018ff22b42e414aa97f1e6452df89e6127255e959735e42eba525455bd6
font_01_sfnt_off0000e451.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE451 10328 bytes
SHA-256: 88cd8143d1092f5114cf4373fb04e804346ef0a00dfd774dd586abaebf83416c
font_02_sfnt_off00010727.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10727 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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