Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b303c9260d2c430…

MALICIOUS

PDF

77.6 KB Created: 2021-05-12 02:05:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 3960a5a5f69eea7f914cf9f73bb2b685 SHA-1: caa5c5f321c3b56256c3d0067c32bf6dfd6e6210 SHA-256: 6b303c9260d2c4302131bb7ac2fce42b969582ccb0424557bb07cb0fe980adea
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics and a machine learning classifier, specifically flagged as a phishing trojan. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The primary malicious URL identified is https://jottigo.ru/strik?utm_term=cnu+career+center, which is likely used to distribute further payloads or conduct phishing. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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.
  • 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://jottigo.ru/strik?utm_term=cnu+career+center PDF link annotation
    • http://pubguckazan.com/teka_teki_silang_kompasorhg8.pdfIn PDF document text
    • https://cdn.sqhk.co/jefulajidi/juHBuic/instagram_search_user.pdfIn PDF document text
    • https://cdn.sqhk.co/rapovebakeb/ijMicjf/bedugidepulugatagerajid.pdfIn PDF document text
    • https://cdn.sqhk.co/lexebogefaj/jswW9ii/rerosusufuzigilarukaxasak.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496853/normal_5fea1a74223ed.pdfIn PDF document text
    • http://health-top.ru/82115212022hkxs4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386620/normal_60368526ed315.pdfIn PDF document text
    • http://greatmasters.biz/amazon_fire_10_instruction_manualb0mko.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416789/normal_5fca3adc7e85c.pdfIn PDF document text
    • http://domavera.ru/numawinc4k.pdfIn PDF document text
    • https://cdn.sqhk.co/vumivatuvi/fhdhiZZ/3650921976.pdfIn PDF document text
    • https://cdn.sqhk.co/fomiroza/jjIXWie/auctiontime_results_farm_equipment.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/36edbc1e-2060-415d-bf56-5c4c3d3a407d/one_of_us_is_lying_trailer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/062d02a2-193a-4acf-ac05-0e7613d7fbf8/download_running_man_episode_terbaru_drakorindo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c78be5d0-1d4e-43e4-8b1b-d32ec6805afa/how_to_build_a_hybrid_mobile_app.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e8c3751-8690-4a4a-8432-b8e675301240/seworata.pdfIn PDF document text
    • https://e0271a52-a7af-48e9-8a99-924ce320ec62.filesusr.com/ugd/be5703_d509fbad176b490894af5ead6b594819.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/74a3b219-6e0c-4048-9069-f88215ed163b/calories_food_chart_indian.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/32f9b488-ba7e-49f1-9a42-16a5b06ac983/which_total_gym_is_best.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/26fb52a7-d1e0-4b93-b9ac-84d51211b5de/95861125519.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/634452bc-b24a-4e9b-8b76-39890ba7602f/42982355639.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6d3050d-c3af-45ac-8b6d-acad628257fc/67828973121.pdfIn PDF document text
    • https://d872ce2a-2baf-4032-ab86-ab75b2f66d52.filesusr.com/ugd/338562_cb95808735ce4a2c861d3c5815a2dc5a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/bae77a9c-db56-479c-87ae-9e085b9ab880/42606858313.pdfIn PDF document text
    • https://dbba0f06-1911-40f0-8c80-a2638c7f81cc.filesusr.com/ugd/b13fd1_c86bbe66f5ef4cd9bac080f2f9d1eb2b.pdf?index=trueIn 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_off0000f242.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF242 4488 bytes
SHA-256: 3bc688d20a9f97133d83b62c81c13d64523a22a4076ca395dee20b8593186d61
font_01_sfnt_off0001018c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1018C 11424 bytes
SHA-256: 36dab61e240160a4ff586401d5dadd7698dcb104bc1b8cf93743f82bea655e88

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