Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a720f4d083e2f36…

MALICIOUS

PDF

74.8 KB Created: 2021-05-09 04:06:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 859518ad9bebee4fdf438c2ca5a884c6 SHA-1: ceccdfd46ec880884577ddb300fcf98fe5ca35cc SHA-256: 8a720f4d083e2f36a8d6ea10a994751e2698bad57adbad2a596e4188042c28d3
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The document contains numerous embedded URLs, many pointing to disposable hosting, suggesting it functions as a link farm or phishing lure. The presence of 'utm_term' parameters in some URLs indicates an attempt to track user interactions, further supporting a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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.
  • 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://kuzutuzo.ru/strik?utm_term=family+feud+questions+and+answers+for+kids PDF link annotation
    • https://delezebewokumod.weebly.com/uploads/1/3/0/7/130776218/f6c77b80a1fb.pdfIn PDF document text
    • http://gexomafe.mypressonline.com/24820142492.pdfIn PDF document text
    • http://kedamijofulufep.mygamesonline.org/xomitenagosid.pdfIn PDF document text
    • https://kaxogirigajel.weebly.com/uploads/1/3/4/6/134611066/daxadezakovud-kepeseje.pdfIn PDF document text
    • https://xumotisububilup.weebly.com/uploads/1/3/4/5/134591263/98bd7a.pdfIn PDF document text
    • https://fatanavaxiwakat.weebly.com/uploads/1/3/4/6/134606547/5161651.pdfIn PDF document text
    • http://liwurivosopap.medianewsonline.com/business_plan_for_a_fast_food_restaurant.pdfIn PDF document text
    • http://wusozupu.mypressonline.com/learning_bodo_language.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gemovimuwopete.atwebpages.com/9802388794.pdfIn PDF document text
    • https://4461694d-a6f7-4a69-895a-ff5ddeb3c622.filesusr.com/ugd/f504fb_215d50962c6c4627a250c1445c783a93.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/678d10e9-b563-486f-b10a-5c32345d1aa9/49061899597.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/67d74d4c-9f33-4d70-af49-62e2eb012ab3/tri_tronics_classic_70_g3_transmitter.pdfIn PDF document text
    • http://furipurisebete.onlinewebshop.net/52421284149.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/99eb0daa-6938-4764-8fcd-269f3e0aa17d/employees_only_nyc_instagram.pdfIn PDF document text
    • http://kutoxinupuroxo.onlinewebshop.net/jideber.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/64acb12f-35da-4c26-9eff-3a2cca162c73/get_forklift_certified_online.pdfIn PDF document text
    • https://9f5bcc56-a059-4f00-ae85-604acd6a3d2d.filesusr.com/ugd/ac9354_2bb340fde1a241c68c2655bd4bc105f4.pdf?index=trueIn PDF document text
    • https://0306adf0-382e-42f1-903d-71c3961c97f1.filesusr.com/ugd/7ff653_88c71b16a3a44d44a9c1afa68a01dca4.pdf?index=trueIn PDF document text
    • https://7ce190f9-fb8d-496c-a51a-ce151dcc024a.filesusr.com/ugd/e72def_f6714749333745e8a2a067965cf54021.pdf?index=trueIn PDF document text
    • https://5ac9d038-517d-4536-97f6-676423289421.filesusr.com/ugd/b444d4_016fd8605608426ab68b1c959a0fcc67.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a54fbf25-8a22-49da-a90c-8aa26c9461e6/lesamuruzeki.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_off0000e83c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE83C 5392 bytes
SHA-256: 1b642948c31a920c405acfd4e5888c353e971b638745cbd2695e8e590ccabeac
font_01_sfnt_off0000fa9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA9A 10528 bytes
SHA-256: 5bc44e42aa2f5ef5040b5dca58308a606b1fc764c30e13c1fc359b6b44373561

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