Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae994003f679c4e4…

MALICIOUS

PDF

75.9 KB Created: 2021-03-20 13:51:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 56463314ba6ae9f12cff29a12e2aa937 SHA-1: 04b8f9e5a1d27cf4b0eb805167eead85aaad16b2 SHA-256: ae994003f679c4e4fdedaa32133759db91a9512cdb951c38844ca8287b73cc6b
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable domains and are flagged as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. The document body, though heavily obfuscated, suggests a lure related to 'crossword quiz answers', aiming to trick users into visiting these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://midufefew.ru/123?utm_term=crossword+quiz+answers+80s+level+3 PDF link annotation
    • http://triple-doska5.club/tokamigigavalogexetizozud3z73l.pdfIn PDF document text
    • http://kefets.xyz/intermediate_algebra_for_college_students_8th_edition_by_robert_blitzereecqo.pdfIn PDF document text
    • http://winoorama.space/what_is_the_analysis_of_the_poem_if_by_rudyard_kiplingjmgzc.pdfIn PDF document text
    • http://gachihyper.xyz/lukezizam5xtrt.pdfIn PDF document text
    • http://brumbum2.xyz/extremerate_ps4_controller_dtfs_led_kitep6aq.pdfIn PDF document text
    • https://dijizuwuke.weebly.com/uploads/1/3/3/9/133999270/xegevanifez-gusizipuror.pdfIn PDF document text
    • http://onlinetiser.website/bosch_mitre_saw_gcm12sd_manuali1tqc.pdfIn PDF document text
    • http://teplotronic.ru/82087632097b1csp.pdfIn PDF document text
    • https://monaxakapivelor.weebly.com/uploads/1/3/1/1/131164425/f4dbd945560ad.pdfIn PDF document text
    • http://baltika-trans.ru/wenefonavuricwt0c.pdfIn PDF document text
    • https://xoxovumalojiru.weebly.com/uploads/1/3/0/8/130874224/lodurapitida.pdfIn PDF document text
    • https://jesasifewom.weebly.com/uploads/1/3/1/4/131453969/8184382.pdfIn PDF document text
    • https://tipirigemiwar.weebly.com/uploads/1/3/4/0/134016889/3040459.pdfIn PDF document text
    • http://idealicaitalia.website/96493217285ahc7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://711a90e7-97f2-4eab-8690-3003ec1e9b64.filesusr.com/ugd/a0905b_8ec18b5a57134df68e93c892108a6e04.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pegebunov/best_oil_filled_radiator_uk_reviews.pdfIn PDF document text
    • https://ad0d0dbb-669b-46a9-85df-79487014a0f3.filesusr.com/ugd/00d95d_ed1a1516c4cf4469ae2e1d8a8c54e46a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/garorowa/gibeluxisem.pdfIn PDF document text
    • https://s3.amazonaws.com/rijaliwiguvex/darkness_rises_android_release_date.pdfIn PDF document text
    • https://s3.amazonaws.com/ginutu/13920188020.pdfIn PDF document text
    • https://s3.amazonaws.com/toguvaju/48932217347.pdfIn PDF document text
    • https://6440a9f6-5e82-4153-977b-4ffe9374ec4a.filesusr.com/ugd/7182f3_0e1f44495e7c4dec8e42cc9608c03e59.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_off0000e8e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8E8 5552 bytes
SHA-256: f058b32821050c45ebe07424b5c16d41318da44fe1c21982ce88e1caad600084
font_01_sfnt_off0000fbee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBEE 11620 bytes
SHA-256: 923a3a59b2e78cccbf73f9ddeae05dfad58b91f728781a9fdb1396014f7bed1f

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