Malicious PDF — malware analysis report

Static analysis result for SHA-256 86b028ec135f5925…

MALICIOUS

PDF

82.1 KB Created: 2021-03-03 16:15:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: e0e5f52787c053527891eb52bbb5c9ea SHA-1: 38c6cd4294032892f6bf057a9131b5db06ab6185 SHA-256: 86b028ec135f5925cf19c0fb6b143785099845bf8751c6ed339358d7a3915585
196 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to SEO redirectors, with one prominent example being 'https://botokaw.ru/strik?utm_term=slow+cook+baked+chicken+breast'. This indicates a link farm or phishing attempt designed to drive traffic to malicious sites. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan.

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://botokaw.ru/strik?utm_term=slow+cook+baked+chicken+breast PDF link annotation
    • https://tatogupuragafa.weebly.com/uploads/1/3/4/0/134096405/1849676.pdfIn PDF document text
    • https://wipasokewuwil.weebly.com/uploads/1/3/4/0/134000036/tunumejelitukadakisu.pdfIn PDF document text
    • https://mejebepagomuda.weebly.com/uploads/1/3/4/4/134494428/lawexosud.pdfIn PDF document text
    • http://zuvabefip.22web.org/84614773269.pdfIn PDF document text
    • https://dufubixapitosig.weebly.com/uploads/1/3/4/5/134503348/wuzopupifo-nanowuxej-getife.pdfIn PDF document text
    • https://sezibuginodeso.weebly.com/uploads/1/3/4/4/134470526/7915025.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/zonebon/81081627280.pdfIn PDF document text
    • http://meferujapepaz.epizy.com/nagevalupogalusera.pdfIn PDF document text
    • https://s3.amazonaws.com/nuxulikiwab/channa_mereya_ninja_full_movie_3gp.pdfIn PDF document text
    • http://bojisunizinop.epizy.com/lawn_boy_user_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/zafibimutadoti/wolofofuposuxadim.pdfIn PDF document text
    • https://s3.amazonaws.com/rivazixexuguri/36945191033.pdfIn PDF document text
    • https://s3.amazonaws.com/xutomoxu/abba_happy_new_year_midi.pdfIn PDF document text
    • http://biborufa.epizy.com/84799177793.pdfIn PDF document text
    • http://vasedazixi.rf.gd/65051601674.pdfIn PDF document text
    • https://s3.amazonaws.com/mogedozara/brochure_templates_for_google_docs.pdfIn PDF document text
    • https://s3.amazonaws.com/pewebopufupe/79353261359.pdfIn PDF document text
    • https://s3.amazonaws.com/xeponodij/27422189009.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010460.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10460 5428 bytes
SHA-256: e41ba8c878fa2c1d127e2ca2eed8cc99b69e874dd45677af79cd6ddd9321e615
font_01_sfnt_off000116dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116DD 10760 bytes
SHA-256: 1700219a01517e91b371f523c598ee6a0948ce4f88977dfe66ccc99e56771394

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