Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a1546b23ce080e9…

MALICIOUS

PDF

70.7 KB Created: 2021-04-11 13:00:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 967243e4ea5187a4cb7d81935fff29cd SHA-1: d8578b1e5b50b4694685f0af7dcf73c869533402 SHA-256: 8a1546b23ce080e9a3149662c63507b5de01a7df916ad894994f695c1cc11410
126 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with one prominent URL, 'https://jottigo.ru/strik?utm_term=bass+tracker+seats+ebay', appearing to be a phishing or redirection link. The document body, though heavily obfuscated, suggests a lure related to 'bass tracker seats ebay', likely intended to trick users into clicking the malicious link. The presence of multiple PDF-specific heuristics, including link farming and external URI references, further supports the phishing attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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=bass+tracker+seats+ebay PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4481552/normal_60172760f1002.pdfIn PDF document text
    • http://ruzamaji.getenjoyment.net/dupematugejowabiweripo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458404/normal_600a4b641028a.pdfIn PDF document text
    • http://gisoboxizaza.mygamesonline.org/64936532129.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479718/normal_6061cf092a6bd.pdfIn PDF document text
    • http://kudikadip.getenjoyment.net/vbu_b_tech_syllabus.pdfIn PDF document text
    • http://vegofejolafud.mygamesonline.org/65516249922.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387054/normal_5fd200fa873f1.pdfIn PDF document text
    • http://wudenufodoroziv.scienceontheweb.net/list_of_important_days_in.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kujugabudejise.rf.gd/80448059430.pdfIn PDF document text
    • http://vusomafolu.rf.gd/63872841337.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c9b44a6-18d5-4d68-9fe3-70dc1c5d831e/thank_you_god_quotes_for_another_day.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd48b6c2-7f84-4a4c-96eb-e56d443c802e/91672627121.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f233941-5dce-4f18-b679-875203845e01/xobim.pdfIn PDF document text
    • http://sidepojedava.myartsonline.com/business_vocabulary_in_use_intermediate_book.pdfIn PDF document text
    • http://buzumigasox.myartsonline.com/kipolarizijise.pdfIn PDF document text
    • http://ledigiluzazuvi.rf.gd/8992582313.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/88df519d-d18a-4376-9a30-5723f7ab2119/89715774871.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2bd2d99b-86c6-406b-b51c-833ce6867c51/what_is_spain_traditional_music.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb995e67-aad5-42bc-aee7-1e1de529399c/ralotizofugokuxorinusudu.pdfIn PDF document text
    • http://xejobutek.onlinewebshop.net/xuxalegedupoxofag.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_off0000d7c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7C7 5116 bytes
SHA-256: 6c66533778b53e10d6b45a8d9e6e036edcc9f546db1aa2d826e45997eb0c7979
font_01_sfnt_off0000e94a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE94A 10672 bytes
SHA-256: 208b6de0da368db9b6fdf0453141d4fecca1748cdc4d3050ca38bbea60513e52

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