Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c8ba0b38f39bbaf…

MALICIOUS

PDF

79.9 KB Created: 2021-05-25 01:00:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 82a92448eb58673d8bf37fc4724b3b9c SHA-1: 33452975debf8a13a65ef7ac7c518656bcf9a270 SHA-256: 5c8ba0b38f39bbaf9c1c07811fd5df0baf8c436b2403bf8f29c2fc93a53968f8
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier. It contains a link farm with numerous links to disposable hosting sites, designed to redirect users to malicious infrastructure. The primary malicious URL identified is https://yafferge.ru/strik, which is likely part of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=ladki+beautiful+kar+gayi+chull+mp4+video+song+free+download In PDF document text
    • https://zolidejowifaw.weebly.com/uploads/1/3/5/3/135313364/kimomenop_zewumotoderire_zinebabigub_diluge.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479932/normal_5fe397d431d63.pdfIn PDF document text
    • https://fokereja.weebly.com/uploads/1/3/1/8/131856005/kekupofo-radixurasori-siliwinina-josojasidegivo.pdfIn PDF document text
    • https://defagetomorig.weebly.com/uploads/1/3/4/5/134576552/zokakuxopasote.pdfIn PDF document text
    • https://tedovuja.weebly.com/uploads/1/3/4/4/134465286/rogugoleb.pdfIn PDF document text
    • https://samojosaletope.weebly.com/uploads/1/3/4/0/134017273/365685.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455659/normal_60161397d0da1.pdfIn PDF document text
    • https://vakajufatig.weebly.com/uploads/1/3/5/3/135332685/3a72076615aac.pdfIn PDF document text
    • https://xiduzejeg.weebly.com/uploads/1/3/1/6/131606953/vosikareragupuforeti.pdfIn PDF document text
    • https://fipaziditude.weebly.com/uploads/1/3/4/4/134465794/wumutipes.pdfIn PDF document text
    • https://redorofi.weebly.com/uploads/1/3/5/3/135383823/zepoli.pdfIn PDF document text
    • https://piwaxiru.weebly.com/uploads/1/3/4/8/134882920/popupud.pdfIn PDF document text
    • https://sapesikunudob.weebly.com/uploads/1/3/1/3/131398489/57163c814.pdfIn PDF document text
    • https://kokurakigid.weebly.com/uploads/1/3/4/8/134866761/617561.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492573/normal_6011a71b56982.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/sosupejuxofedo/lejuxavotazefisefowu.pdfIn PDF document text
    • https://s3.amazonaws.com/pujirageg/sabobaxutevarizovumuleniw.pdfIn PDF document text
    • https://s3.amazonaws.com/nowokil/75965155099.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e072dc4-78d5-443a-91ae-092193c69e02/casio_protrek_prg_270_specs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c43d0df-f9b1-4e46-a20d-7035442681f2/waffle_house_job_positions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/92a24bc3-91cd-4917-a36c-d39bb6e8c77a/stock_symbol_for_petroleum_companies.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3f061ad-8896-44a5-91d3-87d393cbfa99/zokudokalozopabipotej.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c1959eb-b537-4eaa-ba91-5fbf9fc64ba0/venn_diagram_practice.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_off0000e0bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0BD 6056 bytes
SHA-256: 4739a6e7513d28cb292d5ae16a979a9fd4137a4791033bd3b2f397b29075075f
font_01_sfnt_off0000f556.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF556 11464 bytes
SHA-256: 38c2be8981d07cc6035eaf4eb75bd41cbbbd65587fd41e03bc049b17a0b7ed38
font_02_sfnt_off00011c77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C77 16060 bytes
SHA-256: d8a1a34de14a7b8fce5e51635835121d353d188f9ac9ce1e11538509fd4c5cdc