Malicious PDF — malware analysis report

Static analysis result for SHA-256 f482b2bd2144a518…

MALICIOUS

PDF

69.1 KB Created: 2021-02-18 09:59:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 4890bb1245877ebcbf7ab1d4fdc2fea1 SHA-1: f891c80fff6b00aba1c67f69b40cf10e6a4baaae SHA-256: f482b2bd2144a518ba02d13da4fc30ffafca43d8dc982c7a53945573a3fb437d
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 0.9998

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
  • 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://druttle.ru/strik?utm_term=garmin+vivofit+jr+2+battery+issues PDF link annotation
    • https://bujasosepamus.weebly.com/uploads/1/3/4/6/134626994/99aaeb1d.pdfIn PDF document text
    • http://groshyk.site/auto_craft_body_and_paint1o5dg.pdfIn PDF document text
    • http://diguduv.iblogger.org/is_death_cure_the_last_movie.pdfIn PDF document text
    • https://vapaniwagivu.weebly.com/uploads/1/3/4/4/134442769/nobisexumigemutitevo.pdfIn PDF document text
    • https://gigerexug.weebly.com/uploads/1/3/5/3/135341911/kabexazegaw.pdfIn PDF document text
    • https://pesiwuveso.weebly.com/uploads/1/3/5/3/135392822/801cf0.pdfIn PDF document text
    • http://fredo.bike/angus_thongs_and_perfect_snogging_book_freen7mej.pdfIn PDF document text
    • https://kokilanoru.weebly.com/uploads/1/3/4/0/134012510/6191341.pdfIn PDF document text
    • https://meloxatug.weebly.com/uploads/1/3/0/9/130969811/nokuteg.pdfIn PDF document text
    • https://zoseduzarososu.weebly.com/uploads/1/3/2/7/132740870/9454023.pdfIn PDF document text
    • http://itdiscounts.info/rocket_league_average_rankj35va.pdfIn PDF document text
    • http://padujosa.22web.org/sagedivig.pdfIn PDF document text
    • https://lopuxewununoj.weebly.com/uploads/1/3/4/7/134748711/6518021.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/sinadi/93469248286.pdfIn PDF document text
    • http://lisotabisalak.epizy.com/resume_graphic_design_template.pdfIn PDF document text
    • http://nuxumejaxumem.epizy.com/xagamupif.pdfIn PDF document text
    • http://baverasoge.epizy.com/32470221262.pdfIn PDF document text
    • http://tifureboriva.epizy.com/14486736998.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_off0000ce87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE87 5424 bytes
SHA-256: 28b33bf5e79db910d7375c820b51f492947286cec4f61aeafa908d6f62ba3573
font_01_sfnt_off0000e0fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0FB 10748 bytes
SHA-256: 588fa8b167ad6b3006626e210a7804baf4f4ea55b55a355fc8d82ab5c7049f63

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