Malicious PDF — malware analysis report

Static analysis result for SHA-256 75c9fe5cef5f743b…

MALICIOUS

PDF

80.9 KB Created: 2021-06-01 14:10:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 72ecf7b7f831769224a539af21f80e06 SHA-1: 88e54e51bcecddd722fa8bcc286a80a129954749 SHA-256: 75c9fe5cef5f743bdf69065fbde25f61c79f87ca7e5425c3b055671d8b929429
186 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The file contains a large number of external links, many pointing to disposable hosting services, suggesting it functions as a link farm. The primary purpose appears to be directing users to external sites, potentially for phishing, SEO manipulation, or to download further payloads.

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://catamma.ru/pbw?utm_term=science+skills+worksheets+grasping+graphing+answers PDF link annotation
    • https://kuvuwivozud.weebly.com/uploads/1/3/6/0/136091804/zawiwibolis_xiwuxotubegepem.pdfIn PDF document text
    • https://kakulekatorud.weebly.com/uploads/1/3/4/6/134681497/7906337.pdfIn PDF document text
    • https://nirodafudo.weebly.com/uploads/1/3/4/6/134697392/1144604.pdfIn PDF document text
    • https://zunijitulizi.weebly.com/uploads/1/3/5/3/135305500/fb57da069dbbe6c.pdfIn PDF document text
    • https://gagopono.weebly.com/uploads/1/3/2/6/132681316/sojijix.pdfIn PDF document text
    • https://dijafujuzu.weebly.com/uploads/1/3/4/3/134369935/xuxufaruxexuzaxutez.pdfIn PDF document text
    • https://ledoxobi.weebly.com/uploads/1/3/4/7/134703017/1649298.pdfIn PDF document text
    • https://veretiwuwe.weebly.com/uploads/1/3/1/4/131406621/lumak.pdfIn PDF document text
    • https://fazuzuxidugijef.weebly.com/uploads/1/3/4/4/134475184/zoverujaziwidiji.pdfIn PDF document text
    • https://fuzujaloxoz.weebly.com/uploads/1/3/4/6/134684853/filumoluzitaduj-wufajisikudago-sidaxozeraxi.pdfIn PDF document text
    • https://jezagegilefu.weebly.com/uploads/1/3/4/3/134307882/8041110.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bemulopawed.pbworks.com/f/amar_chitra_katha_full_collection.pdfIn PDF document text
    • http://lokiboz.pbworks.com/f/who_is_the_maker_of_lol_dolls.pdfIn PDF document text
    • http://pamotekegopa.pbworks.com/w/file/fetch/144439689/64179152009.pdfIn PDF document text
    • http://mefijunov.pbworks.com/f/53181496414.pdfIn PDF document text
    • http://biwonuv.pbworks.com/f/how_much_does_a_johnson_25_hp_weight.pdfIn PDF document text
    • http://rugewenuzed.pbworks.com/w/file/fetch/144422814/543861619.pdfIn PDF document text
    • http://mizunebapod.pbworks.com/f/kahoot_hack_auto_answer_bot_2021.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_off0000ff7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF7D 5456 bytes
SHA-256: 37d63bda8bb9417496923c65c714d24d5d178b3542f65e3524593fb939407c44
font_01_sfnt_off0001121f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1121F 10652 bytes
SHA-256: bec832bf3c7ccb63b5d949e8f52e452c33c09a2e417d56385d48d2a9f334041e

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