Malicious PDF — malware analysis report

Static analysis result for SHA-256 62c41ceaae10884f…

MALICIOUS

PDF

76.3 KB Created: 2021-02-26 10:57:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 0183fd623329013dae9fad2ce4423cb5 SHA-1: 0e3dd7b5bebd97c9b93b98ae220655bcbe9231b9 SHA-256: 62c41ceaae10884f215aead92582b7dde7fe1a6fc057a4066e668742a76dc0e8
186 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous external URLs, many hosted on disposable domains, suggesting a phishing or malware distribution campaign. The heuristic 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' indicate a large number of links designed to appear as search results. ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of an attempt to redirect users to malicious content.

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://fokemale.ru/wb?keyword=how%20to%20use%20wps%20button%20on%20hitron%20router PDF link annotation
    • https://modisogisutoval.weebly.com/uploads/1/3/5/3/135390942/9905538.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383689/normal_5fe02ef5d2d6d.pdfIn PDF document text
    • http://shtangye.xyz/89749587785sp32l.pdfIn PDF document text
    • http://teksalon.xyz/20278030110voxs0.pdfIn PDF document text
    • https://libuxematofep.weebly.com/uploads/1/3/1/0/131070581/jonasav.pdfIn PDF document text
    • https://fuvapevamasazu.weebly.com/uploads/1/3/4/5/134507747/tabodepevuxuvuz.pdfIn PDF document text
    • https://rebejudan.weebly.com/uploads/1/3/5/3/135316845/zapubu.pdfIn PDF document text
    • http://bcpreactiva-enlinea.com/wexilaruminelonab92q.pdfIn PDF document text
    • https://tulopudegiwidal.weebly.com/uploads/1/3/0/7/130739196/nujoz_vudem_fadipimoru_samizulojel.pdfIn PDF document text
    • https://zidefiwemisuj.weebly.com/uploads/1/3/1/6/131606537/joluzaxinozu.pdfIn PDF document text
    • http://yozi.store/invitation_card_psd_filex05s4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://butadiviwev.rf.gd/animation_movie_software_free_3d.pdfIn PDF document text
    • http://jaremov.rf.gd/80845000906.pdfIn PDF document text
    • http://rexerikilo.epizy.com/brothers_karamazov_online.pdfIn PDF document text
    • http://vufobaratoja.epizy.com/losasuwutomu.pdfIn PDF document text
    • http://mubadel.epizy.com/technical_theatre_resume_template.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_off0000ebf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF1 4860 bytes
SHA-256: 822409aab650c593112a6ce0683ef8e5a37e84a63b6a609d13765dcaccbeb9dc
font_01_sfnt_off0000fc79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC79 12624 bytes
SHA-256: 1247caed33633bce38d3c800a743f28cac64becff1c489897ec11177969ac9fd

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