Malicious PDF — malware analysis report

Static analysis result for SHA-256 962c9a661257d6df…

MALICIOUS

PDF

72.4 KB Created: 2021-03-07 06:29:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: a9dc822a10fc689edd2e097d5c3b5f16 SHA-1: ac79db7736b999d647cae9bd70d6099f95434d09 SHA-256: 962c9a661257d6df1376510f06a4f5b5c4e46b9a0553a17c29b963815055d898
186 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed for SEO manipulation or phishing. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous embedded URLs point towards an attempt to redirect users to potentially harmful content.

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://jottigo.ru/wix?keyword=biology+matters+workbook+answer+key+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4426944/normal_604431ead5d8b.pdfIn PDF document text
    • https://pulapafux.weebly.com/uploads/1/3/0/8/130874232/mafos_padatipo.pdfIn PDF document text
    • http://tijudozi.scienceontheweb.net/17055785781.pdfIn PDF document text
    • https://cdn.sqhk.co/bupewazadufa/npja1ij/how_to_talk_with_parents_in_ptm.pdfIn PDF document text
    • https://rofexelugikovu.weebly.com/uploads/1/3/4/7/134732340/nobusujomi.pdfIn PDF document text
    • https://cdn.sqhk.co/puwipaneke/2ZIjgCC/bogesuxefidapo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371523/normal_6034ccb8af831.pdfIn PDF document text
    • https://verulezame.weebly.com/uploads/1/3/0/8/130814285/lotusovaravisubugi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467945/normal_6009b2956ffe2.pdfIn PDF document text
    • https://zetozegazironik.weebly.com/uploads/1/3/2/6/132696155/lekezijema_fanuras_gizajaferado.pdfIn PDF document text
    • http://bisibometixo.mywebcommunity.org/vufaruxupum.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376087/normal_5fd98e00a0f47.pdfIn PDF document text
    • http://nunopasatipimav.medianewsonline.com/91036616744.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://2e5cbe44-7de3-4e3f-b94c-8a8567814465.filesusr.com/ugd/f96b02_eb87350bc8eb47f1a564940e172f8509.pdf?index=trueIn PDF document text
    • http://vimixof.onlinewebshop.net/administration_job_titles_list.pdfIn PDF document text
    • http://lojubefogugiku.onlinewebshop.net/the_uses_of_enchantment_bettelheim.pdfIn PDF document text
    • https://0443db59-9f9d-4031-b786-8a5723798135.filesusr.com/ugd/ab62d6_3b20989ab428451a8067f0c3ea34aa43.pdf?index=trueIn PDF document text
    • https://3d9783aa-30dd-4d0b-8ba9-0fe7ac0036c6.filesusr.com/ugd/2f8cea_09034d1468da4bf5969d62ea7d4d1a48.pdf?index=trueIn PDF document text
    • https://de315c38-daa2-4293-b666-e554ba9b7d65.filesusr.com/ugd/564d2e_f15ffcc3c1164daeb1ad517a0c111ac1.pdf?index=trueIn PDF document text
    • https://78905da9-dd21-4190-abaa-c894c042e703.filesusr.com/ugd/851c7c_eeaf9ee0801344a990d4b6718c5bad50.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_off0000de49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE49 5808 bytes
SHA-256: 927e3117d82f69cf63d753d6bc94c53918bad589cf916ecbfaee39eca678b84a
font_01_sfnt_off0000f211.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF211 10020 bytes
SHA-256: c8bd53b94e850013769732b3e29523c5e40eae00bcfc76a8e6537c4b8ebad5a3