Malicious PDF — malware analysis report

Static analysis result for SHA-256 c96c53b731117ae0…

MALICIOUS

PDF

72.1 KB Created: 2021-02-16 01:38:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-25
MD5: b1c2ae48938d01a40e8433a1fb4b3bb0 SHA-1: 0cc1b413a45d4c8abd36ad7e4abe2a14159fee3c SHA-256: c96c53b731117ae0ed5a31c0ef8967c713fa3050e0feb8fc2a63d6b18063c733
136 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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://jottigo.ru/wix?keyword=classifying+numbers+rational+irrational+worksheet PDF link annotation
    • https://cdn.sqhk.co/jabosuve/hgjhY7Q/webatixokutuluwadow.pdfIn PDF document text
    • http://trikolor.site/magical_explorer_novelr03uo.pdfIn PDF document text
    • https://rubopawine.weebly.com/uploads/1/3/1/0/131070645/kibidekefuzekexo.pdfIn PDF document text
    • https://vemosigexirapi.weebly.com/uploads/1/3/4/3/134387812/98a279a5751a.pdfIn PDF document text
    • https://jupikojeba.weebly.com/uploads/1/3/0/9/130968920/lowutanakifolef.pdfIn PDF document text
    • https://kekufekogaj.weebly.com/uploads/1/3/4/7/134768560/tiluzerusomiso-gajebexuzike.pdfIn PDF document text
    • https://palisuxil.weebly.com/uploads/1/3/1/0/131071308/lepuxiratamo.pdfIn PDF document text
    • http://findattime.com/in_which_of_these_bonding_patterns_does_x_obey_the_octet_rulecik2n.pdfIn PDF document text
    • https://kaxaxelakag.weebly.com/uploads/1/3/4/2/134235500/ketodix_marixeselonaz.pdfIn PDF document text
    • http://monubaz.iblogger.org/business_plan_template_app_startup.pdfIn PDF document text
    • https://sadejakudabad.weebly.com/uploads/1/3/5/9/135965210/222d5edd9d40a1.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/xubifupi/1078931883.pdfIn PDF document text
    • https://s3.amazonaws.com/vibuvomomuv/30435793953.pdfIn PDF document text
    • http://pugijomo.epizy.com/legislative_branch_review_crossword_puzzle_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/gimufesajo/articles_of_organization_texas.pdfIn PDF document text
    • https://s3.amazonaws.com/wamatasamegu/2310362148.pdfIn PDF document text
    • https://s3.amazonaws.com/gupawupigawono/plague_inc_nano_virus_normal_guide.pdfIn PDF document text
    • http://jemibare.epizy.com/66870120800.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_off0000db8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB8B 5484 bytes
SHA-256: 57f3665c9f5c3e1aecb9fac54964b6929ffd49b911437e117d51dfbaa206b8a1
font_01_sfnt_off0000ee25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE25 10936 bytes
SHA-256: 13ab6be20ee7792c6350638dcf85f13f9d25f8b41490fe7847978374cb58f8ca

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