Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb67b523559fc675…

MALICIOUS

PDF

74.6 KB Created: 2021-03-03 12:26:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: ff08240a40cc70af513a7e877052ef57 SHA-1: c0e22bac3a5be3005f6bb670ed16bee7189c7f91 SHA-256: eb67b523559fc675b4bf6ae4543b5d7f5a6b5b4e45295a669876631a081cd7da
196 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document contains numerous external links, masquerading as search results for a common query, to host a link farm. The primary lure URL is "https://jumiwimov.ru/strik?utm_term=how+many+carbs+are+in+taco+bell+nacho+fries", which redirects to other PDF files. This behavior is indicative of a phishing or content-farming scheme designed to drive traffic to malicious or low-quality sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jumiwimov.ru/strik?utm_term=how+many+carbs+are+in+taco+bell+nacho+fries PDF link annotation
    • https://cdn.sqhk.co/pugepavofu/izeibgc/mx_player_pro_mod_apk_2020_latest_version.pdfIn PDF document text
    • http://nejevefivi.mypressonline.com/which_of_the_following_is_a_topic_that_would_be_studied_in_macroeconomics.pdfIn PDF document text
    • https://cdn.sqhk.co/kamavedes/G8ihLD9/fakiwebuso.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369663/normal_6022c129b7602.pdfIn PDF document text
    • https://tevadurut.weebly.com/uploads/1/3/2/6/132682826/2967011.pdfIn PDF document text
    • https://cdn.sqhk.co/jujadiziga/TEjbyhc/car_mechanic_simulator_ps4_xp_cheat.pdfIn PDF document text
    • https://zojovotonoturur.weebly.com/uploads/1/3/5/3/135348007/koduwikefonoruma.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/lerezazo/66627397265.pdfIn PDF document text
    • https://s3.amazonaws.com/wajibile/dark_souls_3_ringed_city_trophy_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/pizivurapab/55882415526.pdfIn PDF document text
    • http://kapirexazi.onlinewebshop.net/pofexu.pdfIn PDF document text
    • https://s3.amazonaws.com/nisiwanolom/32555993204.pdfIn PDF document text
    • https://s3.amazonaws.com/zumezeviwakiz/como_hacer_un_panel_solar_casero_para_maqueta.pdfIn PDF document text
    • https://s3.amazonaws.com/sulasatevirexo/nursing_exam_questions_and_answers_in_hindi.pdfIn PDF document text
    • https://s3.amazonaws.com/vexeliku/mpsc_forest_pre_answer_key_2016.pdfIn PDF document text
    • https://s3.amazonaws.com/lukepepe/51573492263.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_off0000e5e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5E2 5416 bytes
SHA-256: f074313613e744c94f224939b683a2cc9ded2042918bbd16168f2b8762a76b5d
font_01_sfnt_off0000f833.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF833 10764 bytes
SHA-256: 6eb33cde13cf32617d89fa3276730375b27452ae1ad22d969b1ebe229e9fa3ad

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