Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f3618c77216c7ac…

MALICIOUS

PDF

77.4 KB Created: 2021-03-17 15:08:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 761debc9a204ba36b5b56745ac4f6c70 SHA-1: bb71f42b689bf15d9899a1197d0f0030254d44b6 SHA-256: 4f3618c77216c7ac8195917e474209eba41e937aa57a594a1fd45abe06696342
134 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The presence of numerous external URIs, including a link farm hosted on disposable domains, suggests a phishing or malware distribution scheme. The 'SE_DOWNLOAD_BUTTON' heuristic further supports the idea that the document is designed to trick users into clicking a link to download something malicious.

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
  • 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.
  • 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
  • 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://fokemale.ru/123?utm_term=nysc+biometric+data+capture+software PDF link annotation
    • https://jazelisis.weebly.com/uploads/1/3/4/8/134870131/gaforevu_debuzezum.pdfIn PDF document text
    • http://koreatop.ru/how_to_reset_the_furnace_limit_switchwrims.pdfIn PDF document text
    • https://xasigebopij.weebly.com/uploads/1/3/0/7/130775268/7790055.pdfIn PDF document text
    • http://ionatr.fun/593312888248wk3n.pdfIn PDF document text
    • https://popajilosofov.weebly.com/uploads/1/3/0/7/130776408/6cd9905dbf0581.pdfIn PDF document text
    • https://jabifuvos.weebly.com/uploads/1/3/1/0/131070291/zajelefojetamob.pdfIn PDF document text
    • https://pixipemojawipe.weebly.com/uploads/1/3/4/4/134459682/4d1baf45854ee36.pdfIn PDF document text
    • http://janafan.scienceontheweb.net/struts_framework_book.pdfIn PDF document text
    • http://beduzevitugok.mypressonline.com/nozobunakaju.pdfIn PDF document text
    • https://nesexabaxurozij.weebly.com/uploads/1/3/4/8/134898102/5694489.pdfIn PDF document text
    • http://bogipeborowe.sportsontheweb.net/11048404998.pdfIn PDF document text
    • http://spindlndou.space/trigan_empirea8ncv.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://xefiposokupama.myartsonline.com/61285028291.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8de42d2c-55f6-40d6-a862-e3c8d373a8b8/what_to_read_after_the_couple_next_door.pdfIn PDF document text
    • http://dijipola.onlinewebshop.net/dracopedia_the_bestiary_download.pdfIn PDF document text
    • http://kivozusemu.atwebpages.com/business_intelligence_case_studies.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b367ee42-f8d4-42df-8116-928aa6493678/bank_59_germantown_wi.pdfIn PDF document text
    • http://zogoxuf.atwebpages.com/teacher_evaluation_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0cf3655b-af45-4ca2-ac66-6af3875033af/where_is_the_cheapest_place_to_buy_a_dyson_v11.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d1fee967-93e4-4c34-9f66-b5cbb222a1bc/what_is_the_basic_storyline_of_les_miserables.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f9ec513e-d0b4-4974-b364-e92b93d02878/gokabapewusivez.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_off0000e1e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1E6 5348 bytes
SHA-256: 954d4d87a964fece48f4353e2d9baa7b25de14f2f7da847fa6ae00f5c0877f00
font_01_sfnt_off0000f428.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF428 11124 bytes
SHA-256: a76243d279f65ee9d0a8e10200d50da8e5e4cefcc1e617ff156edcb93f4add74
font_02_sfnt_off00011a18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A18 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378