Malicious PDF — malware analysis report

Static analysis result for SHA-256 05c6a8af49b4ce2d…

MALICIOUS

PDF

82.7 KB Created: 2021-03-07 11:03:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: c0030a9c33ed6a0e322e788a84f817c6 SHA-1: 28042cd9e86b43cda3654e585606d110049579e9 SHA-256: 05c6a8af49b4ce2dae6d2b35cbcb7fe6ee0afb22262b5b9b3ba6ad9f734c2c35
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a large number of embedded URLs, many pointing to disposable hosting, suggesting a link farm designed to redirect users to malicious sites. While no scripts were explicitly extracted, the presence of numerous external URIs indicates an attempt to lead the user to a compromised or malicious resource.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://lozipotod.ru/123?utm_term=what+are+the+four+steps+involved+in+the+training+process PDF link annotation
    • https://cdn.sqhk.co/zanemulazif/v9heieX/21668214259.pdfIn PDF document text
    • http://tiwirulesu.iblogger.org/79797669557.pdfIn PDF document text
    • https://cdn.sqhk.co/duwenaxiseve/lbhiNjh/english_grammar_basics_free_download.pdfIn PDF document text
    • http://ligumiju.iblogger.org/android_tv_cast_from_iphone.pdfIn PDF document text
    • https://cdn.sqhk.co/vimerokil/QjdzYja/fudopuxa.pdfIn PDF document text
    • https://cdn.sqhk.co/pafevola/etihjew/pabababumoniwiri.pdfIn PDF document text
    • http://zomolejefej.mywebcommunity.org/diary_of_a_wimpy_kid_cast_then_and_now_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/wesegagage/jcJvuYN/swollen_cuticle_toe.pdfIn PDF document text
    • https://cdn.sqhk.co/pomorezolo/ggsMQ09/basic_addition_facts_to_10_worksheets.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://zatuvejamubolo.atwebpages.com/descargar_app_para_aprender_ingles_gratis_sin_internet.pdfIn PDF document text
    • http://bumerezuwo.epizy.com/move_files_to_sd_card_android_s9.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a62a5ea3-74e5-4718-b8a2-a072541eaa91/7437797687.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eefdd368-f83a-4abd-b406-8defaaff6499/xelexu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/353e0ee7-b4dc-4daf-937a-989813c54c45/toduninijemini.pdfIn PDF document text
    • http://pibozaxasoloje.rf.gd/how_can_i_get_rid_of_pimple_marks.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4ea2676-805b-4b1f-bfb0-12fa383765c6/how_to_read_java_code_for_dummies.pdfIn PDF document text
    • http://sefutuda.epizy.com/greek_mythology.pdfIn PDF document text
    • http://nejarisiwudu.atwebpages.com/98264752325.pdfIn PDF document text
    • http://jirabasojexosud.atwebpages.com/washington_state_university_football_coaching_staff.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f7f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7F3 5372 bytes
SHA-256: 502ff129f7b0be2e009af04c5e2194e9992c7e045a1321c0f0444be02cf68cfb
font_01_sfnt_off00010a48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A48 10804 bytes
SHA-256: faa918efa1e130e2388500bd60338d85964222dfd36035a449dde504f81bd516
font_02_sfnt_off00012f39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F39 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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