Malicious PDF — malware analysis report

Static analysis result for SHA-256 550d8b1f735437a0…

MALICIOUS

PDF

75.2 KB Created: 2021-04-03 01:22:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 7233ccfee452d4433dcd0418535bbfaf SHA-1: 5b18a7d29366750db7d71dda018b4b2bc30b2d67 SHA-256: 550d8b1f735437a0a8d925f73798b0b1607fa18c31a576859c7496461ba2ab01
156 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 0.9995

Heuristics 5

  • 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.
  • 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://zajinet.ru/strik?utm_term=my+cousin+rachel+trailer+espa%25C3%25B1ol PDF link annotation
    • http://bitopikagigev.iblogger.org/lipuninuduz.pdfIn PDF document text
    • https://cdn.sqhk.co/motakolilo/fhhzYjg/61849570410.pdfIn PDF document text
    • https://cdn.sqhk.co/wefekoferu/ciaXjjf/felatedipelabefululig.pdfIn PDF document text
    • https://cdn.sqhk.co/jozanafe/hd5d33Y/lisobigoza.pdfIn PDF document text
    • http://xobaxibudizoba.22web.org/59877024477.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/pizivurapab/wafusikapotomekunamadizef.pdfIn PDF document text
    • https://s3.amazonaws.com/ropidadegaxut/the_lies_of_locke_lamora_film.pdfIn PDF document text
    • https://s3.amazonaws.com/lixisariwulo/19799236662.pdfIn PDF document text
    • http://gumuwojurigab.epizy.com/asl_alphabet_chart.pdfIn PDF document text
    • http://tuzexom.rf.gd/nadub.pdfIn PDF document text
    • https://436c154b-1c2d-4c60-9768-ed3a268ef5e1.filesusr.com/ugd/e8e253_4e907fb7525e489f85203f432c3c8ed9.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bodajaku/37554798181.pdfIn PDF document text
    • https://s3.amazonaws.com/zeworibuzoza/what_do_white_calla_lilies_symbolize.pdfIn PDF document text
    • https://s3.amazonaws.com/bisegilupuf/lonely_planet_lapland_sweden.pdfIn PDF document text
    • http://sogonuvusawi.epizy.com/93598108803.pdfIn PDF document text
    • http://wetizizokixo.epizy.com/iowa_wild_pheasant_hunting_guides.pdfIn PDF document text
    • https://394fded3-a37f-45fe-8092-07e0884d2d31.filesusr.com/ugd/bdbc91_840c9283c47b4824abadb3a03e0c665e.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d186.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD186 5340 bytes
SHA-256: 8bb38fe507279e8faedce7139c3c90b7c133397bbf691df7c73ba451166cbe3e
font_01_sfnt_off0000e37a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE37A 10956 bytes
SHA-256: 3a917e1e5d06e7a36d5db0ebc8d3164ade05affbafa60205896d6800bf0197c3
font_02_sfnt_off000108d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108D2 16060 bytes
SHA-256: df1d2c903cabdf2976887e260da0b25217edeb5ce2b71f315001024534e8e210

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