Malicious PDF — malware analysis report

Static analysis result for SHA-256 650ec43f276fe8bb…

MALICIOUS

PDF

73.5 KB Created: 2021-03-16 04:03:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 83b6e02a296cbcbb7795fbafb015424a SHA-1: d121fc085314ad0353fe103be3cda34438f53a09 SHA-256: 650ec43f276fe8bb9bee617a719e1100016daadd960a2cd9309df5790bdbfcd3
126 Risk Score

Malware Insights

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

The PDF file is detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous links to external websites, with one prominent URL suggesting a lure related to 'photosynthesis concept map biology answers'. The presence of embedded URLs and the link farm heuristic indicate an attempt to redirect users to malicious content, likely for credential harvesting or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://resalured.ru/wix?keyword=photosynthesis+concept+map+biology+answers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4470029/normal_60260935cc80a.pdfIn PDF document text
    • http://tijudozi.scienceontheweb.net/debumilubaxajol.pdfIn PDF document text
    • https://cdn.sqhk.co/gitogozune/gGVihcJ/juvibigimorojotorivaxulal.pdfIn PDF document text
    • https://cdn.sqhk.co/dugukiser/Sdicvgg/beatport_techno_charts.pdfIn PDF document text
    • http://bred-enligne.com/nadakuxils4ys.pdfIn PDF document text
    • http://kedugobepuged.mywebcommunity.org/vozagumebavupeborufa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404299/normal_5fc76f75733a5.pdfIn PDF document text
    • http://apsdd54gfv.xyz/bisopomalewojijitz61a8.pdfIn PDF document text
    • https://cdn.sqhk.co/jigitovewuk/Qjghihd/vofuxowavuxinumepedum.pdfIn PDF document text
    • http://gubixazolela.sportsontheweb.net/25537983943.pdfIn PDF document text
    • http://xegazinijitup.mywebcommunity.org/82424334480.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501198/normal_602c076772d05.pdfIn PDF document text
    • http://wabaxifejem.sportsontheweb.net/apprendre_le_franais_mp3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387420/normal_6038e39be712e.pdfIn PDF document text
    • https://cdn.sqhk.co/bumogebiz/KZ0bHhg/rigigejexobugumid.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/lebejos/gmail_for_android_mobile.pdfIn PDF document text
    • http://rosajeku.myartsonline.com/blockchain_technology_presentation.pdfIn PDF document text
    • https://s3.amazonaws.com/jefazaxal/35397402986.pdfIn PDF document text
    • https://s3.amazonaws.com/xifabilejilab/gastroenterology_guidelines_diverticulitis.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_off0000e290.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE290 5684 bytes
SHA-256: ade5847119622f2638cfe6681bff581d760a9d75862f1a8f5db679557188bb8e
font_01_sfnt_off0000f5cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5CF 10276 bytes
SHA-256: e1b8989e09e06c89182e2417f2122beb1c71b4acbfe1e5b50bca29e45d7bcdd7

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