Malicious PDF — malware analysis report

Static analysis result for SHA-256 acfa6deffa778a99…

MALICIOUS

PDF

73.7 KB Created: 2021-03-25 12:03:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: e85a39c327625f7d295f68af8beb9df7 SHA-1: d97064dfc46c9c2f9e0043cc470c0caa799427d0 SHA-256: acfa6deffa778a993c2c59acf476daaa90a90b379bd8930011b3c6f17e1447de
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://bologen.ru/award?keyword=articles+a+an+the+pdf+worksheet PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4488822/normal_5fdde666b2209.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384640/normal_6013b22805e61.pdfIn PDF document text
    • http://memubalejegezur.66ghz.com/isaca_cisa_study_guide.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374371/normal_604491b4d9ab7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419413/normal_60556ac55eff0.pdfIn PDF document text
    • https://dapalirodo.weebly.com/uploads/1/3/1/4/131483520/tilufobajub-sasalorogexa.pdfIn PDF document text
    • http://mosebuzixat.mywebcommunity.org/81113825959.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421213/normal_5fc56d72234be.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421969/normal_6050f74cc6b0d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446491/normal_60534157b750b.pdfIn PDF document text
    • http://mivolamuzimapu.22web.org/zolapimitodomewaloridor.pdfIn PDF document text
    • https://loxoxonejuk.weebly.com/uploads/1/3/4/6/134684666/6102271.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381756/normal_5fce85e00257e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467300/normal_5ffbef676277e.pdfIn PDF document text
    • https://gojufepegaxop.weebly.com/uploads/1/3/4/3/134339744/dobazodalaru.pdfIn PDF document text
    • http://bosemefawixuwov.mypressonline.com/96528274559.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vujurow.rf.gd/bookworm_adventures_crack.pdfIn PDF document text
    • http://madukavinoxonal.epizy.com/renewal_of_firearms_licence_safety_test_answers.pdfIn PDF document text
    • http://penevebepor.epizy.com/seweraxu.pdfIn PDF document text
    • https://d0bf7e8b-5449-41c0-93e9-161603c0719f.filesusr.com/ugd/197ed4_4f1f6203b0db4c2982e1e8d5379c8092.pdf?index=trueIn PDF document text
    • https://2634c7da-0b58-4de1-95e3-ef2217a723ee.filesusr.com/ugd/f934bc_645a1d2cd9f844fda2b2098a400ba4ac.pdf?index=trueIn PDF document text
    • http://vajapojaperusu.myartsonline.com/gizefubagevasomijole.pdfIn PDF document text
    • https://fa3f2985-242d-4a4c-93c0-6adbfb259eaf.filesusr.com/ugd/8dbe7a_7591589f5c414a90960c7e274c708d30.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_off0000e03e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE03E 5388 bytes
SHA-256: f42312b1f0cce7c9178a2ca24366919b2cdec84ba82871ffdfca49be462edbe9
font_01_sfnt_off0000f2a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2A2 11024 bytes
SHA-256: 0bb914a0d3395ee197a90937d56ff19cb2895eeb16bf4801c9a1f58974ead123