Malicious PDF — malware analysis report

Static analysis result for SHA-256 41bd2205ea03bd7f…

MALICIOUS

PDF

87.9 KB Created: 2021-03-29 01:35:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0359cd31b108ab70b865e129b7a89305 SHA-1: 52a8c96172adc8e371204c809663e06243c9020a SHA-256: 41bd2205ea03bd7f9acef63fd8afa60a0fd9aea585b0c3d49a50d6a1799ec1e7
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing lure. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • 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.
  • 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.
  • 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://ponafet.ru/award?keyword=free+email+extractor+from+pdf+file
    • https://wopufibirebosaw.weebly.com/uploads/1/3/4/4/134466277/1734374.pdf
    • https://dodupezuvu.weebly.com/uploads/1/3/4/4/134443873/rafaxaretikenuk_mikoxenapoxem_gimanuzaxalitep.pdf
    • https://nenilinuda.weebly.com/uploads/1/3/1/3/131383514/sekaju_bexekaneforoz.pdf
    • http://silujokiz.mypressonline.com/90212705323.pdf
    • https://wapoduleg.weebly.com/uploads/1/3/4/8/134882123/3928bcc16ace.pdf
    • https://bewotababuruga.weebly.com/uploads/1/3/1/1/131163836/9391007.pdf
    • https://femevidawivuk.weebly.com/uploads/1/3/1/0/131071063/nomuvegomutale_rofurogori.pdf
    • https://kuvitarige.weebly.com/uploads/1/3/4/0/134095916/woxufeziv_pesusowivago_jolagulopu.pdf
    • http://ligumexijigab.getenjoyment.net/amphotericin_b_nephrotoxicity.pdf
    • https://zenamuvevabun.weebly.com/uploads/1/3/1/4/131453902/4116290.pdf
    • https://xifekuvazunavel.weebly.com/uploads/1/3/4/7/134748582/385bcd82ba60d.pdf
    • https://fobulosarurek.weebly.com/uploads/1/3/3/9/133997379/jenubiv-nuwavo.pdf
    • http://vixitatevejiwo.getenjoyment.net/star_trek_voyager_elite_force_2_no_cd.pdf
    • https://fusazalokedukek.weebly.com/uploads/1/3/4/7/134729088/53241c8f525ea.pdf
    • https://megidawuxuta.weebly.com/uploads/1/3/4/7/134729580/cd410aa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/b4e0a73a-4fad-4242-a8eb-193f01e6f5ab/nys_driver_license_renewal_covid_19.pdf
    • https://uploads.strikinglycdn.com/files/1f344a9f-d687-4f81-ac39-f44156fca8ef/botiquin_de_primeros_auxilios_para_autos_reglamentario_argentina.pdf
    • https://uploads.strikinglycdn.com/files/02aef4f2-55f6-4714-854b-96cb040119cd/how_are_cultures_diffused.pdf
    • http://wenares.myartsonline.com/hitachi_nr90aes1_nails.pdf
    • https://uploads.strikinglycdn.com/files/5ec16d46-0fd3-4d42-9a9b-37551082b65a/what_does_for_dummies_mean.pdf
    • http://wufagezigedo.onlinewebshop.net/bank_of_baroda_loan_form.pdf
    • http://jujuletofu.onlinewebshop.net/business_case_studies_class_12.pdf
    • http://tavamikilav.myartsonline.com/wind_generator_project.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010f2e.bin
5f43ace92b622fd0f82c4246ef06ccc501ab46e8ef77e596628d704dc8da629b
pdf-font-stream PDF embedded font (sfnt) at offset 0x10F2E 4828 bytes
font_01_sfnt_off00011f9a.bin
c0e333aff5179b893a5e2128b76c53703b15dabeb592ec374d8b7e8f538e2d02
pdf-font-stream PDF embedded font (sfnt) at offset 0x11F9A 10556 bytes
font_02_sfnt_off000143d6.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333
pdf-font-stream PDF embedded font (sfnt) at offset 0x143D6 4324 bytes