Malicious PDF — malware analysis report

Static analysis result for SHA-256 f884e2742ae8f462…

MALICIOUS

PDF

90.9 KB Created: 2021-02-22 09:41:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: f42d8129b658b46ffd245a1495f497ad SHA-1: 5880a6c70dd78d645d83edb0f993fca560eb8988 SHA-256: f884e2742ae8f462636f08f143e441567be6a0b4669db33362b44b52a95b99b9
146 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. The malformed stream length heuristic further supports exploitation attempts within the PDF structure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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=young+justice+miss+martian+age PDF link annotation
    • http://botojagi.iblogger.org/powezazud.pdfIn PDF document text
    • http://xupenirulavep.iblogger.org/moperofukuvujisufexepo.pdfIn PDF document text
    • http://gaydating.world/lujizyjvwf.pdfIn PDF document text
    • http://birodavaz.22web.org/48940646974.pdfIn PDF document text
    • http://busforpay.online/34296796256o55nq.pdfIn PDF document text
    • http://ctuxuu.com/adolescent_psychologyfkeb6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://tudutov.rf.gd/manufacturing_industries_class_10_mcq_with_answers.pdfIn PDF document text
    • http://kowetomad.epizy.com/46395167214.pdfIn PDF document text
    • https://s3.amazonaws.com/xilasisefi/37927769429.pdfIn PDF document text
    • https://s3.amazonaws.com/dinigugaxej/bioelementos_organicos.pdfIn PDF document text
    • http://lenumizisil.rf.gd/49296572129.pdfIn PDF document text
    • http://wawaxujogoned.rf.gd/5047599473.pdfIn PDF document text
    • https://s3.amazonaws.com/kegovev/latitude_e7440_spec_sheet.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011c2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C2A 5008 bytes
SHA-256: f830942f4da295dda93431396ae1878704ed8bb4be24c206ca54e51ef7ba876d
font_01_sfnt_off00012d1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D1C 10364 bytes
SHA-256: 4e6cbd6ba59aacfc1af80134a197460f9a45561c0f115f48d493f6a2472c1b82
font_02_sfnt_off00015099.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15099 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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