Malicious PDF — malware analysis report

Static analysis result for SHA-256 9337031466b32c05…

MALICIOUS

PDF

76.4 KB Created: 2021-05-20 17:47:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 5391202b504b41d591a210e13370ac7e SHA-1: 7cca5622e8b8cbef29ed730d00c0e28dc2fa534f SHA-256: 9337031466b32c057409078e8a340b7ff6ad5864d978b90b5ab2df8635452a79
194 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, suggesting a link farm designed to distribute malicious content or phish for information. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of techniques used to deliver second-stage payloads or redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://gimoguvi.ru/strik?utm_term=what+color+bare+minerals PDF link annotation
    • https://vetinuvejozijuk.weebly.com/uploads/1/3/4/7/134745319/jekap-wigamenexanapez.pdfIn PDF document text
    • https://degexaxi.weebly.com/uploads/1/3/1/4/131406510/5892539.pdfIn PDF document text
    • https://bagibobujinokat.weebly.com/uploads/1/3/5/3/135312275/eb23e4081.pdfIn PDF document text
    • https://tusixifowidafoj.weebly.com/uploads/1/3/1/4/131437116/tajulisemozu_ruwunuxujisa_dewopasutur.pdfIn PDF document text
    • https://dutumujupag.weebly.com/uploads/1/3/1/3/131383630/xarefuva.pdfIn PDF document text
    • https://gopogusefivow.weebly.com/uploads/1/3/1/4/131406686/kefevi_jafadu_vinoneno.pdfIn PDF document text
    • https://moxisubisoxotap.weebly.com/uploads/1/3/4/8/134893280/ff5e38be.pdfIn PDF document text
    • https://tagewojozupuk.weebly.com/uploads/1/3/4/3/134358966/964cc1ec3eb38ff.pdfIn PDF document text
    • https://rusuligoxajikug.weebly.com/uploads/1/3/4/3/134399392/lararigutuvaginagabo.pdfIn PDF document text
    • https://pepigapipewoma.weebly.com/uploads/1/3/4/0/134000130/5346217.pdfIn PDF document text
    • https://bituxomixa.weebly.com/uploads/1/3/4/1/134131270/1906847.pdfIn PDF document text
    • https://xemojunaxumig.weebly.com/uploads/1/3/4/2/134265853/8621d9a9.pdfIn PDF document text
    • https://tapajiwegunet.weebly.com/uploads/1/3/1/3/131380495/zadikez-vijumixada-jorovazodem.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/704ebcb2-1a5b-4be9-9e0e-c354892f2ea7/taurus_pt111_g2_recall.pdfIn PDF document text
    • https://s3.amazonaws.com/viboxikuz/licence_agreement_template_software.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c9e30c8-eccc-446b-9825-8c6b0cbbdb85/zidaru.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/73030c2d-2fd1-475e-a8bd-fe0de0b476ff/how_to_replace_vivint_thermostat_battery.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee89d8ef-959b-45c6-9f0c-12c2cac3ced7/blackstar_id_core_10.pdfIn PDF document text
    • https://s3.amazonaws.com/fejenijovekozu/betepibesupuzagijunog.pdfIn PDF document text
    • https://s3.amazonaws.com/xoferuzu/what_calculator_is_needed_for_college_algebra.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e16e363-8eb6-46cd-90f9-beb8b916e777/bebumukewasakopew.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_off0000ec72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC72 5192 bytes
SHA-256: 52e4907ada183249110fc4ddfbe1fe31f628c4799c2b3e12dcbda5bc523e0822
font_01_sfnt_off0000fdfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDFA 11308 bytes
SHA-256: 4d6dc123443d42b3bd6a4d4b8af362787637ac467bc07aa710308105bad59158