Malicious PDF — malware analysis report

Static analysis result for SHA-256 25a03d695154f028…

MALICIOUS

PDF

74.8 KB Created: 2021-03-17 23:19:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 604c5bfc92558bc0fb1792e2bbf458f9 SHA-1: 15e366182d618efbd16eb5262a5dce08f06a8bdc SHA-256: 25a03d695154f02898a2f76058e95208e051184a969391d99454533d981c6dfc
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs that redirect to known malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier and ClamAV also flagged this file as malicious, suggesting it is part of a phishing or malware distribution campaign. The document body was unreadable, but the presence of numerous links and the critical heuristic firings strongly indicate a malicious redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=d%2526d+painted+miniatures+canada In PDF document text
    • https://cdn.sqhk.co/rapovebakeb/yhg1jjo/luxibidis.pdfIn PDF document text
    • http://guwomedo.iblogger.org/revukunejejuro.pdfIn PDF document text
    • http://redirerer.medianewsonline.com/kopuli.pdfIn PDF document text
    • http://uspehdnyaaxyz.xyz/bateaux_parisiens_audioguide5f3q6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369150/normal_5ffe212303f40.pdfIn PDF document text
    • https://cdn.sqhk.co/fuwifemi/hixjhaX/zosinegulopemuzul.pdfIn PDF document text
    • http://juzufezike.mygamesonline.org/nikomasiwoj.pdfIn PDF document text
    • https://cdn.sqhk.co/tedigedubemi/PjgR4hg/gakexawefuzikow.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478148/normal_602ed0dba2f04.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367680/normal_5fca33b182298.pdfIn PDF document text
    • https://cdn.sqhk.co/xomakonezema/ggWhefg/blizzard_authenticator_app.pdfIn PDF document text
    • https://cdn.sqhk.co/jirudumom/4ggjjbl/16176169429.pdfIn PDF document text
    • http://best-ital.fun/85546973240e27f0.pdfIn PDF document text
    • https://cdn.sqhk.co/regomesu/Tavjahb/stickman_tennis_2_player_unblocked.pdfIn PDF document text
    • http://salestore.pro/english_conversation_101dynoj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377656/normal_602f705b7cb12.pdfIn PDF document text
    • https://cdn.sqhk.co/jolodovi/hghifjb/45347447820.pdfIn PDF document text
    • http://rokonagusedat.22web.org/vegefeganeluzedoselinuzi.pdfIn PDF document text
    • http://nesobaka7.xyz/cyberflix_for_laptopvt050.pdfIn PDF document text
    • http://simopuvoramawu.mywebcommunity.org/84444609436.pdfIn PDF document text
    • https://cdn.sqhk.co/gogojelawov/ghexPYz/kiwimagamenepopuvop.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mevedokepovi.epizy.com/appcake_para_android.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_off0000eb7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB7E 4156 bytes
SHA-256: 9253c4ec90eb8b217ae91b3aef6412788d3d1419415539c5cfb70110cf842fd1
font_01_sfnt_off0000f9ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9AC 10612 bytes
SHA-256: 59daf01624863c3ee6e841d7faac0557c751119f0905fc30388df1ffa18e9aee

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