Malicious PDF — malware analysis report

Static analysis result for SHA-256 41b8d4d4d3cc05e9…

MALICIOUS

PDF

73.8 KB Created: 2021-06-08 19:37:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 7a65332550ecb1b3006cfd00bc191423 SHA-1: c9519f659f314cfd1ce463c523c33d178c709c70 SHA-256: 41b8d4d4d3cc05e9196f9f8968707b18b0ab09d988af365155b567950b10e13d
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan-like behavior. It functions as a link farm, directing users to numerous external URLs under the guise of providing educational materials. The primary URL, 'https://archism.ru/pbw?utm_term=neet+biology+chapter+wise+questions+and+answers+pdf+download', is designed to lure unsuspecting users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://archism.ru/pbw?utm_term=neet+biology+chapter+wise+questions+and+answers+pdf+download PDF link annotation
    • https://sejumajofejopib.weebly.com/uploads/1/3/2/7/132740214/zezaxafisanepi_nugeduza_makaguvurun.pdfIn PDF document text
    • https://radotarurejatu.weebly.com/uploads/1/3/1/6/131607565/9473610.pdfIn PDF document text
    • https://xonimitofowe.weebly.com/uploads/1/3/2/6/132682232/sajiwisuzux-xukepiwomujiji-xirubivatugojo-tojegepodog.pdfIn PDF document text
    • https://wabiwuwisurukim.weebly.com/uploads/1/3/2/6/132682822/6749538.pdfIn PDF document text
    • https://janepowowufevi.weebly.com/uploads/1/3/4/5/134506071/mefiwomi-dagopinar.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448980/normal_601e4a82ea344.pdfIn PDF document text
    • https://fedubipogumuwu.weebly.com/uploads/1/3/1/3/131379546/juwilotakulupib_nuvatuxuxo_gerolex_lesar.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384028/normal_6056b60ebc566.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488092/normal_5ff07917e08fc.pdfIn PDF document text
    • https://wenigekotowas.weebly.com/uploads/1/3/4/5/134576851/sanejese.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482638/normal_602df900b4eaf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418000/normal_6053c6c208008.pdfIn PDF document text
    • https://xupulepil.weebly.com/uploads/1/3/4/3/134322414/mewumifuwavem_poteb_pakubi_koketewukilas.pdfIn PDF document text
    • https://tijezelaxupoki.weebly.com/uploads/1/3/5/3/135340387/8756515.pdfIn PDF document text
    • https://vesedosaripiwuj.weebly.com/uploads/1/3/1/6/131636692/2535066.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/120fa695-361c-4489-9c57-bf4d357c1d4a/48770867892.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ba2c33f-d5c2-40a7-9708-4b08e2af5ff1/what_comes_in_a_crash_cart.pdfIn PDF document text
    • http://garewewaziwu.pbworks.com/f/breezin_thru_theory_answer_key_chapter_9.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/02edea76-c337-45fb-a4d0-ca4d1eb413fe/question_based_selling_training.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/26e3d803-856d-47a8-963a-d52bd685cb46/xovopir.pdfIn PDF document text
    • http://wisarazed.pbworks.com/f/the_vampire_diaries_season_1_episode_1_english_subtitles_watch.pdfIn PDF document text
    • http://zawepiko.pbworks.com/w/file/fetch/144548916/zadevowerasamiwexewik.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b31e7b0-57b8-434e-9af8-f920f2bae3a5/jemora.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_off0000e039.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE039 5848 bytes
SHA-256: a07df7a9f8f45715bae5cbd08b9e9b2a81e169e29bbe2dfbdf76be8751eceaf7
font_01_sfnt_off0000f432.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF432 10880 bytes
SHA-256: ed1303c5472e06a8406e27a86b5013cf441bf1fbfd9e969010dd1a8d60c35c90