Malicious PDF — malware analysis report

Static analysis result for SHA-256 89ac1939baa8e181…

MALICIOUS

PDF

72.8 KB Created: 2021-02-26 21:58:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 9c5e524495411bcef7fc12be9e538636 SHA-1: 9a02d4264b31b0b21b57fcd8a4ba8f0b49074d15 SHA-256: 89ac1939baa8e181ad8c44900b0d2ce8b5916af21186794663ae98d5544b839a
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of embedded links pointing to various external domains, many of which appear to be disposable or associated with link farms. This behavior is indicative of SEO manipulation or a distribution mechanism for malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://crophysi.ru/wix?keyword=turn+of+river+middle+school In PDF document text
    • http://lodomujimujug.mywebcommunity.org/ravebiriforodatazosimo.pdfIn PDF document text
    • http://oficialshoes.site/38694851045vbpr5.pdfIn PDF document text
    • https://cdn.sqhk.co/jakufomego/K0qUheY/sbi_cashback_offer_in_amazon.pdfIn PDF document text
    • https://cdn.sqhk.co/lajawawinu/jagdzij/positive_parenting_solutions_toolbox.pdfIn PDF document text
    • http://xolokukifimiv.sportsontheweb.net/lojedu.pdfIn PDF document text
    • https://cdn.sqhk.co/zaxuloxedu/X748jbg/88508023980.pdfIn PDF document text
    • http://epaytds.xyz/ravished_by_the_triceratopssvzm2.pdfIn PDF document text
    • https://cdn.sqhk.co/mekibekowufe/iAghhd1/adidas_sweatpants_womens_cheap.pdfIn PDF document text
    • http://leledup.mypressonline.com/how_do_you_light_a_marco_gas_fireplace.pdfIn PDF document text
    • https://cdn.sqhk.co/pobopuwubox/ji6jgK9/8798583620.pdfIn PDF document text
    • https://cdn.sqhk.co/samekikogeri/bVjgehg/easy_cnc_router_software.pdfIn PDF document text
    • https://cdn.sqhk.co/dobopejig/UigBp4s/green_mucus_poop_pregnant.pdfIn PDF document text
    • https://cdn.sqhk.co/labifikup/jjjcigR/harris_job_fair_melbourne_fl.pdfIn PDF document text
    • https://kijilijesudopob.weebly.com/uploads/1/3/0/7/130739968/97f23ff781ded87.pdfIn PDF document text
    • http://vopugixeroramox.medianewsonline.com/the_brigade_pros_focus_during_the_military_decision-making_process_mdmp_is_on.pdfIn PDF document text
    • http://frontglass.xyz/8441458752308ccl.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tuwutexo.onlinewebshop.net/websters_third_new_international_dictionary_unabridged_online.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_off0000e37b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE37B 5060 bytes
SHA-256: 692ca829b86e7020684e4105a7470f4093b5938b785689681d7df812b8e21f99
font_01_sfnt_off0000f493.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF493 9772 bytes
SHA-256: f8c59be43d915463d76c05bc6e18f12b7d826c34842710191b80b544244d4ae5

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