Malicious PDF — malware analysis report

Static analysis result for SHA-256 85893b70af30ff4f…

MALICIOUS

PDF

98.1 KB Created: 2021-04-15 01:14:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: ad5a65840353e6d3f34d84a896e9c2a1 SHA-1: b50a539901b80e7dab0f76a9064741508cbb266d SHA-256: 85893b70af30ff4fab4a1f1f223ac4301aa2ba15b0463e403dd223f24159783b
196 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which are part of an SEO link farm designed to redirect users. The primary malicious URL identified is https://vilenefex.ru/strik?utm_term=high+flight+poem+youtube, which is flagged as a redirector for free-download phishing. ClamAV also detected this file as Pdf.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://vilenefex.ru/strik?utm_term=high+flight+poem+youtube PDF link annotation
    • https://poximixej.weebly.com/uploads/1/3/0/7/130776069/paberi_mejar_saxuvini.pdfIn PDF document text
    • https://wozizagozesa.weebly.com/uploads/1/3/4/8/134848764/xexekuju.pdfIn PDF document text
    • https://gopaposoxawa.weebly.com/uploads/1/3/0/7/130740193/445d9c47b7.pdfIn PDF document text
    • https://pidodogifir.weebly.com/uploads/1/3/1/3/131383649/bizafowemi_mezavab_lagolex.pdfIn PDF document text
    • http://joberorerorepi.iblogger.org/55294804162.pdfIn PDF document text
    • https://jekazaneret.weebly.com/uploads/1/3/1/4/131455475/3502235.pdfIn PDF document text
    • https://moramiwise.weebly.com/uploads/1/3/4/7/134736235/nipupopopofadu.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/jasadavebaga/68679001943.pdfIn PDF document text
    • http://fusizizugunu.epizy.com/iracing_car_setup_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/bevarolimesale/whatsapp_status_love_in_marathi.pdfIn PDF document text
    • https://s3.amazonaws.com/dupula/darupiwasekalo.pdfIn PDF document text
    • https://s3.amazonaws.com/purixifusipelid/who_pays_freight_fob_shipping_point.pdfIn PDF document text
    • https://s3.amazonaws.com/semuxemakaw/buladinonisenumoxejidaxax.pdfIn PDF document text
    • https://s3.amazonaws.com/rorives/winaped.pdfIn PDF document text
    • https://s3.amazonaws.com/fipijife/nepulijototifatesoga.pdfIn PDF document text
    • https://s3.amazonaws.com/wonumafubij/clases_sociales_en_la_epoca_colonial.pdfIn PDF document text
    • http://zurufeb.rf.gd/wupasamedolokegekiputup.pdfIn PDF document text
    • http://bowukedogatowo.epizy.com/avast_antivirus_pc_software_free.pdfIn PDF document text
    • https://s3.amazonaws.com/gomaxod/automatic_control_systems_kuo_7th_edition.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_off000143a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143A5 5036 bytes
SHA-256: 31d558e81d873b669d7b8054a1ba710f6db32021d0c7ca227fdb48f7c10d5703
font_01_sfnt_off000154b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x154B6 11444 bytes
SHA-256: 4ae14016cf948417e8c4119efc744c0d9941d0a1ce5513e85bad3503d3280cca

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