Malicious PDF — malware analysis report

Static analysis result for SHA-256 f379806b9d9ca1d0…

MALICIOUS

PDF

76.5 KB Created: 2021-03-05 07:37:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 0a56f9b493be57b78fe1ca6373446c2f SHA-1: 069c74795b96086dfb51f4fa70a7b56d672291e5 SHA-256: f379806b9d9ca1d09fec038e23a5883525f1f7320881dbcdb7422ad309754277
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, containing numerous external URLs pointing to potentially malicious content or phishing sites. The presence of multiple disposable and potentially SEO-optimized links suggests an attempt to distribute malware or lure users to fraudulent websites.

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://zajinet.ru/strik?utm_term=ar+blue+clean+pressure+washer+383l PDF link annotation
    • http://saratov.ooo/xps_to_converter_apkvvefi.pdfIn PDF document text
    • http://epaytds.xyz/ares_wizard_zip_file_downloadoolhx.pdfIn PDF document text
    • https://dafozadojav.weebly.com/uploads/1/3/4/7/134764431/5fee9be50.pdfIn PDF document text
    • http://fitnesspack.net/english_exercises_possessive_pronouns_and_possessive_adjectivesr7rf7.pdfIn PDF document text
    • http://momentshop.website/16385274496swls0.pdfIn PDF document text
    • https://repotadidutu.weebly.com/uploads/1/3/4/3/134310826/rerikaxuzu_davuwoxumus.pdfIn PDF document text
    • http://mif-smeh.space/pelejozozibipupavo9f4l2.pdfIn PDF document text
    • http://romeita.space/56862824189a2d0v.pdfIn PDF document text
    • http://beviluxenumiliv.mywebcommunity.org/how_many_globally_have_died_from_covid.pdfIn PDF document text
    • http://woziwowariv.sportsontheweb.net/46619202298.pdfIn PDF document text
    • https://kokujilu.weebly.com/uploads/1/3/1/4/131453241/vunujor.pdfIn PDF document text
    • http://lojapidabud.mypressonline.com/mountain_america_credit_union_promo_code.pdfIn PDF document text
    • http://resimpub.com/automation_production_systems_and_computer-integrated_manufacturing_4th_editionxjj50.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://217ba8a6-026c-4a9e-b1ce-2eadff0a4a08.filesusr.com/ugd/3d7af5_f578c55b51ac428fa557245709a3192d.pdf?index=trueIn PDF document text
    • https://b64dd490-e5b9-492f-89ff-e398ecee904c.filesusr.com/ugd/5926b4_20802fcdc47b4e4db9f594765e064460.pdf?index=trueIn PDF document text
    • http://sutexuvidag.myartsonline.com/vegetarian_food_recipes_without_onion_garlic.pdfIn PDF document text
    • https://409b2d23-5c1d-402e-97df-26c0da9299b0.filesusr.com/ugd/2e3d42_d7295af9a7bb4cdea92fc18f0896f41b.pdf?index=trueIn PDF document text
    • http://pelebirepopo.onlinewebshop.net/rokumumazid.pdfIn PDF document text
    • https://5e9c932d-19a8-4d5a-a970-d4bc0bcb832b.filesusr.com/ugd/bae0a0_3285f7c9174e4ed1a970f95444651300.pdf?index=trueIn 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_off0000eeac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEAC 5600 bytes
SHA-256: 61b084e3ee07264f6f05d5ebb03388632d3648b8616451e5d1f75e04611cb9ad
font_01_sfnt_off000101bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101BB 10384 bytes
SHA-256: 4e434033693ad8ba3f87b96371fccd5e42bcca2619b058eeb3232e8cc7f38940