Malicious PDF — malware analysis report

Static analysis result for SHA-256 d71255169c3f2bc5…

MALICIOUS

PDF

85.3 KB Created: 2021-05-14 07:24:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 6eb67b17ce770060295fd1b6d16d2d8f SHA-1: 97405d8cc866b6ad07269cb7b85a8fb2dcecd49b SHA-256: d71255169c3f2bc5c98450c1954901eee7b852830413a32b7434b953f3d050dc
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. One of the primary URLs, 'https://dugedepap.ru/strik?utm_term=centurylink+actiontec+c1000a+modem+router', suggests a potential phishing lure related to network equipment. No scripts were extracted, but the PDF structure itself facilitates the redirection to these external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://dugedepap.ru/strik?utm_term=centurylink+actiontec+c1000a+modem+router PDF link annotation
    • https://motodamoz.weebly.com/uploads/1/3/1/4/131452818/nuluf-gozalidulerat.pdfIn PDF document text
    • https://mufusudakewita.weebly.com/uploads/1/3/2/6/132681672/puludu_zopulusawaz_varisibufukipu.pdfIn PDF document text
    • https://dimafivatoputir.weebly.com/uploads/1/3/4/4/134496040/354679efb6.pdfIn PDF document text
    • https://poxokisajape.weebly.com/uploads/1/3/4/5/134592502/pajilaxolimosi_bojefimaxo_jiwasidiwuzupur.pdfIn PDF document text
    • https://kafedujewerom.weebly.com/uploads/1/3/4/6/134622586/fc93d4953.pdfIn PDF document text
    • https://jawenovexexadu.weebly.com/uploads/1/3/4/0/134012785/ruloxasu.pdfIn PDF document text
    • https://xemivigezeb.weebly.com/uploads/1/3/4/4/134481563/jazixorujapefi.pdfIn PDF document text
    • https://xipunozelizu.weebly.com/uploads/1/3/1/3/131382486/suxugoresajusosimomo.pdfIn PDF document text
    • http://foselosen.sportsontheweb.net/31853056695.pdfIn PDF document text
    • https://polovetanofup.weebly.com/uploads/1/3/5/3/135330247/cef63bc1b60c8db.pdfIn PDF document text
    • https://jufesuzukexo.weebly.com/uploads/1/3/5/2/135294717/ae21a.pdfIn PDF document text
    • https://mufajagirudul.weebly.com/uploads/1/3/1/4/131452858/dujofifizuxaruz_kotogaw_wadajepifata_debopalejupok.pdfIn PDF document text
    • https://digagewopaloz.weebly.com/uploads/1/3/4/6/134634746/lenuw_mofitixenaw_sefifufe_demosonofore.pdfIn PDF document text
    • https://latopilufazi.weebly.com/uploads/1/3/4/0/134017217/32029f.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/f82cf964-637a-43cb-b98b-c7bd13319f45/how_to_use_my_jitterbug_smartphone.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/257f4350-0f78-4248-8336-1de96c2b4876/gapik.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e357008-b8b3-49df-94dd-35187322d2ba/how_to_calculate_surface_area_of_a_cylinder_step_by_step.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c90150dc-ab07-492a-9349-4061017a858a/do_termites_have_bent_antenna.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3abbc2e0-fcc9-41fa-a502-582475a903f3/78811157298.pdfIn PDF document text
    • http://rixuroruwe.myartsonline.com/24588359441.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f3618ebf-e6ae-41db-b254-3c73c1697975/new_yorker_magazine_subscription_customer_service.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4eeda3a2-ee08-42ab-b7f4-d5cbdb3541b6/vunanotajisako.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f94b6215-7d4a-4da1-a78c-870ea13c66f8/oracle_pl_sql_datetime_comparison.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f913.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF913 5172 bytes
SHA-256: a750c5fc71ce159858517e91a0224e969bb1fc6e026a390ea09f978ed6f46ca3
font_01_sfnt_off00010a9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A9D 11052 bytes
SHA-256: cf2a1ba20cff83a7745ec79e471e8d0a411f5a1205a0afa01352878c95b21f96
font_02_sfnt_off00013088.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13088 16204 bytes
SHA-256: 95f2a8319533f051e584a9e2aa38e8d42f7eb419abe795cf0dce2d6390e2c0a0