Malicious PDF — malware analysis report

Static analysis result for SHA-256 93a23bf91c3a33ac…

MALICIOUS

PDF

84.2 KB Created: 2021-03-04 17:50:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: df888650bf533f514860ab37c0e2a5e2 SHA-1: 0c522a5ae62e0287b570e84c9655a81e4cf6e0b7 SHA-256: 93a23bf91c3a33ac9d9d6cb803baeb04bc3859e4fb75b0b4aad24e5dbdc29354
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links pointing to disposable hosting, indicating a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware. No scripts were extracted, but the presence of numerous external links suggests an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • 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://jacksth.ru/award?keyword=le+petit+prince+movie+french PDF link annotation
    • http://fepaporipevari.mypressonline.com/semuvus.pdfIn PDF document text
    • https://rurusoweloxefug.weebly.com/uploads/1/3/3/9/133989150/fexababadu_kevesip.pdfIn PDF document text
    • https://cdn.sqhk.co/vopofuxo/tjjfvja/bowikesaw.pdfIn PDF document text
    • https://saletenabij.weebly.com/uploads/1/3/4/3/134339554/0f32a585b80ea7.pdfIn PDF document text
    • http://podipotekoi.ru/logical_and_analytical_reasoning32dfj.pdfIn PDF document text
    • https://wotopegajoxife.weebly.com/uploads/1/3/4/0/134042499/nuziwasibanob.pdfIn PDF document text
    • http://pawomodom.medianewsonline.com/norcold_rv_refrigerator_error_code_no_co.pdfIn PDF document text
    • https://nofoxevejumumu.weebly.com/uploads/1/3/1/8/131857054/fideso-vuwat-fisil.pdfIn PDF document text
    • https://puwegamojone.weebly.com/uploads/1/3/4/7/134702565/pesejerod_getelimutog_tutezas_pobumuzotenawi.pdfIn PDF document text
    • https://cdn.sqhk.co/parabeset/gfmjjcV/62376773850.pdfIn PDF document text
    • http://waranijovuv.sportsontheweb.net/dungeons_and_dragons_online_board_game_free.pdfIn PDF document text
    • http://mikovil.mywebcommunity.org/jaxuna.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469103/normal_5febc743112a5.pdfIn PDF document text
    • https://cdn.sqhk.co/fiwujumejuf/ihjhicF/outbreak_company_female_characters.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454435/normal_60004eb08ee5e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408471/normal_5ff80aacf39bf.pdfIn PDF document text
    • http://alex-chekalev.com/ramp_car_jumping_level_9_walkthrough5telg.pdfIn PDF document text
    • http://newuwedeza.mypressonline.com/blood_bowl_2_vs_legendary_edition.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468294/normal_5fe9c57883798.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tevefetilojas.atwebpages.com/harry_potter_and_the_goblet_of_fire_book_synopsis.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_off00010f8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F8C 4836 bytes
SHA-256: 2c421a01dd059f3e40631c516161fd697bc730e5ca99f0e767a4e9ee93f9a2c3
font_01_sfnt_off00011fe3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FE3 10436 bytes
SHA-256: 5c1a88f4abc4cf6bb86b822dbb1a2b2ce49be98f4ecda8d0976c5695693d6dd2