Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea5708f20406f9a9…

MALICIOUS

PDF

80.9 KB Created: 2021-03-20 19:20:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 1ee3620351f426c8b1e9f389ff473ab5 SHA-1: b62855a18f188f6eb332e936cc64af712e4cb814 SHA-256: ea5708f20406f9a90228dd7fb4d693c894764d6e54dba830c8f987aa8e6f094b
186 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. The primary URL, 'https://kuzutuzo.ru/award?keyword=capf+assistant+commandant+books+pdf', is presented as a search result for specific books, likely to entice clicks. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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://kuzutuzo.ru/award?keyword=capf+assistant+commandant+books+pdf PDF link annotation
    • https://dowanolisedu.weebly.com/uploads/1/3/6/0/136056386/2399406.pdfIn PDF document text
    • http://tozaworewinox.mywebcommunity.org/how_to_connect_polk_psw10.pdfIn PDF document text
    • https://rovumixonisi.weebly.com/uploads/1/3/4/0/134012407/fugabunokogowej-vufakakovigewo.pdfIn PDF document text
    • https://cdn.sqhk.co/goxobuve/chdgdgg/new_xbox_app_beta_ios.pdfIn PDF document text
    • https://xananitape.weebly.com/uploads/1/3/4/0/134095977/jotaxigijelizowex.pdfIn PDF document text
    • https://cdn.sqhk.co/zitedefew/QuijdhG/349_isle_of_pines_mooresville_nc.pdfIn PDF document text
    • http://miromawetibikew.mywebcommunity.org/43894264326.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://borovob.epizy.com/51807165210.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/95278cc4-e5ae-41fc-ab55-08894640b271/xexisufawotudim.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c6d1d5a-96f0-4e88-90f0-15761e164df2/100_dollar_startup_book_in_hindi.pdfIn PDF document text
    • http://bozexefuj.epizy.com/interesting_books_to_read_about_life_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f753c7e-7731-457b-870c-703cffef980f/what_streaming_service_has_how_the_grinch_stole_christmas_cartoon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e513110-fe5f-49f0-bbe7-f82c834d1fae/viduzimomalotiditoxera.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/433cbd68-66ca-4a8e-96f9-9b59071719a3/90074354618.pdfIn PDF document text
    • http://xikebivulusures.rf.gd/cause_and_effect_worksheets_grade_4.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a2e9559-2b83-4369-bbbd-a3883c471bbc/ipod_shuffle_1st_generation_blinking_orange_light.pdfIn PDF document text
    • http://loxexezusus.rf.gd/bededodadinijigev.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dfc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFC2 5284 bytes
SHA-256: f1a62963f032d6ef9bd1a2c264e0bb8793c25fd81568879c929d90eee6bc56a0
font_01_sfnt_off0000f1a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A1 1964 bytes
SHA-256: 1d18534733479c870a78c46a90b83ed8aff410c3511f6838c5b83347f92bfa48
font_02_sfnt_off0000fafb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAFB 10916 bytes
SHA-256: ef063b4c1d5747441e786ce7528e28f36f7d5b0d192431fed058a4c904ce8f9d
font_03_sfnt_off00012025.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12025 16204 bytes
SHA-256: 532315dfdc59b350d447ad91845dd8cc72a836e684f536ab9a4305dc5b53fb8e