Malicious PDF — malware analysis report

Static analysis result for SHA-256 e85517c82745f43c…

MALICIOUS

PDF

81.2 KB Created: 2021-05-24 21:24:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 7d724be50160feffb288a70afd95e534 SHA-1: c27f785a69107316deef25eb3296cf9fd1be113b SHA-256: e85517c82745f43c7dc2dcbf1551a0868a749414b63858a0de3580c69716cf56
196 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external links, many of which are part of an SEO link farm, and one prominent link redirects through 'soxebez.ru'. This domain is associated with phishing and malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or to download a second-stage payload.

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://soxebez.ru/strik?utm_term=mitsubishi+outlander+service+manual PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4482002/normal_5fe41ebd9f0fc.pdfIn PDF document text
    • https://zejuvuvegodefi.weebly.com/uploads/1/3/1/4/131453892/5246542.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494136/normal_600c701460d57.pdfIn PDF document text
    • https://zesidorav.weebly.com/uploads/1/3/1/4/131437831/pidunebesanavobam.pdfIn PDF document text
    • https://wejanorop.weebly.com/uploads/1/3/2/3/132303338/dafefiveko_tafibi_sifatigor.pdfIn PDF document text
    • https://gemitipob.weebly.com/uploads/1/3/4/4/134474898/9c38ce.pdfIn PDF document text
    • https://bizevino.weebly.com/uploads/1/3/4/3/134320064/fumorasudejolux.pdfIn PDF document text
    • https://fuvekusegubo.weebly.com/uploads/1/3/4/7/134736786/basuteziret_jipokexa_tejufidopo.pdfIn PDF document text
    • https://badupulok.weebly.com/uploads/1/3/4/8/134855905/9077206.pdfIn PDF document text
    • https://zanebereraba.weebly.com/uploads/1/3/4/4/134472179/7079028.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/safenalavojuwu/linkedin_android_developer_jobs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d5f42ed-0c52-4b82-8a2c-05e858eb58dc/what_is_meant_by_accounts_payable_aging_report.pdfIn PDF document text
    • https://s3.amazonaws.com/tikofaketonub/barrons_toefl_essential_words.pdfIn PDF document text
    • https://s3.amazonaws.com/wanasuvedigo/rejigaviva.pdfIn PDF document text
    • https://s3.amazonaws.com/kimone/51513899473.pdfIn PDF document text
    • https://s3.amazonaws.com/bolovopizonuki/pidisovonawomeri.pdfIn PDF document text
    • https://s3.amazonaws.com/rimejiguvif/32931420843.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb3e2a5d-1453-464c-9bec-ffcafe4451fb/onn_dvd_player_universal_remote_app.pdfIn PDF document text
    • https://s3.amazonaws.com/gurupixabogivaz/what_are_the_different_formula_to_identify_surface_area_of_a_cone.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_off00010206.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10206 5384 bytes
SHA-256: e715d34b02946679fa999649d7b6ea32f1c37cc502d9631be687c022e73a9992
font_01_sfnt_off00011436.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11436 10380 bytes
SHA-256: bbcbd8a7e8d3ec0617c285bebbd1384931c6665521e8a61bf933c7d8ebbea10a

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