Malicious PDF — malware analysis report

Static analysis result for SHA-256 b16fbce34a77b492…

MALICIOUS

PDF

77.6 KB Created: 2021-03-25 17:46:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 952ab3c9e72a2a6ef16b0cb8aaf03272 SHA-1: b79fb32d8a87e2405ae512020dfba96eb11c2261 SHA-256: b16fbce34a77b4923af592eb095cdc19437a86eabd4644da2c4163bc2bd40fe0
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, with several pointing to suspicious or disposable domains, suggesting a phishing or malware distribution scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this by indicating the PDF is part of a link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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://dugedepap.ru/strik?utm_term=fish+farming+pdf+in+bengali PDF link annotation
    • http://sellforce.ru/bissell_spot_clean_pro_pet_ukf2myv.pdfIn PDF document text
    • http://trikotoria.ru/lalokakozufivokinigjfq99.pdfIn PDF document text
    • https://rozenawaxu.weebly.com/uploads/1/3/4/5/134517597/tozuf.pdfIn PDF document text
    • http://ponaxamewimenul.sportsontheweb.net/glory_and_praise_to_our_god.pdfIn PDF document text
    • https://zebazefapik.weebly.com/uploads/1/3/1/3/131383848/fajenu.pdfIn PDF document text
    • http://bebetadiruj.mywebcommunity.org/how_to_use_spanish_words_in_a_sentence.pdfIn PDF document text
    • http://warupipujamoru.sportsontheweb.net/7534337332.pdfIn PDF document text
    • http://zeruxejobimal.mywebcommunity.org/internationalization_definition_business.pdfIn PDF document text
    • http://homeolimp.com/83973110110tasdm.pdfIn PDF document text
    • http://japarof.mywebcommunity.org/greek_mythology_full_story.pdfIn PDF document text
    • http://mydenverneighborhoods.com/gegavelu2nt41.pdfIn PDF document text
    • https://tulalesin.weebly.com/uploads/1/3/4/8/134876190/7206989.pdfIn PDF document text
    • https://movadopudi.weebly.com/uploads/1/3/0/9/130969115/kumuxuwew_zototapapori_gezumefor.pdfIn PDF document text
    • http://zumofujewor.iblogger.org/what_is_the_overall_purpose_of_the_arkansas_real_estate_license_act.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/purufiz/2006_chevy_equinox_for_sale_ontario.pdfIn PDF document text
    • http://zabirozoxut.epizy.com/ver_un_puente_hacia_terabithia_castellano.pdfIn PDF document text
    • https://s3.amazonaws.com/pazovugal/jafezelikapibad.pdfIn PDF document text
    • https://s3.amazonaws.com/nuxomigo/why_my_2004_ford_explorer_wont_start.pdfIn PDF document text
    • https://s3.amazonaws.com/xesigeze/uniform_allowance_income_tax_act.pdfIn PDF document text
    • http://joratunezawaxa.epizy.com/baahubali_2_telugu_4k.pdfIn PDF document text
    • https://s3.amazonaws.com/kubafezin/pack_n_play_bassinet_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/nafoxuda/malewo.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_off0000f36a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF36A 5548 bytes
SHA-256: 3ec1af4f601e3d25e76d311ca6a589eaca87cc60659d08935042e4159e3c843d
font_01_sfnt_off0001061f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1061F 10312 bytes
SHA-256: 6f76c9d5597eef47a7e409afdf4c25eb6390a1fed5734b12f897716afec09e11

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