Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c80aec0edafd571…

MALICIOUS

PDF

92.3 KB Created: 2021-03-23 05:22:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 924aff255b538713fd8a50324a4baa75 SHA-1: 10f2b8eec68072d07a8675ef45ed3bbba94f0a63 SHA-256: 9c80aec0edafd571cd408e80f991dc532cfabc68e9043958489278206bd1519d
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://nipisod.ru/award?keyword=iata+city+code+list+pdf PDF link annotation
    • http://tusukezilineji.66ghz.com/mid_america_oireachtas_2020_twitter.pdfIn PDF document text
    • https://fetatoba.weebly.com/uploads/1/3/4/6/134689412/473c11e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496151/normal_5ff8ed68ce1c4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384167/normal_6037016c4bb89.pdfIn PDF document text
    • https://mitezexevas.weebly.com/uploads/1/3/4/5/134525922/zosojepazubebeg.pdfIn PDF document text
    • https://jinunezig.weebly.com/uploads/1/3/4/3/134308797/niviji_bevegeviguga.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4468828/normal_5fde050ce2f1b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444378/normal_5fec0146421c1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404723/normal_5fcb0f30bf45b.pdfIn PDF document text
    • https://totijavefukaja.weebly.com/uploads/1/3/4/7/134705726/537872.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jeviruse.epizy.com/dead_man_walking_book_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a3b4a4a-87c7-4c10-a7a6-216580d7392a/mazoze.pdfIn PDF document text
    • https://856cb5e6-6c81-45ce-9604-b57907a15cd2.filesusr.com/ugd/cc3ca9_36584dd9e9eb47b198ea0f587e543203.pdf?index=trueIn PDF document text
    • https://592908bf-dd96-48cc-88d9-ffebbdd10d84.filesusr.com/ugd/f34823_a5fb72fee520488b93dd39f34cf6c3ea.pdf?index=trueIn PDF document text
    • http://fategag.rf.gd/jarisanapibagofibora.pdfIn PDF document text
    • https://cc652f91-b1ab-470c-b36f-46d838ef85b2.filesusr.com/ugd/fbccce_a2175ef507ae4b279322c8136fe0e3de.pdf?index=trueIn PDF document text
    • https://4590046d-f0a9-4171-b8a0-56ff8c1fe63c.filesusr.com/ugd/0bfb20_f255bd577c4e44c392513212d3c8b2f5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc93bb6d-36de-4525-94e4-496e9e3854c6/what_is_the_quote_survival_of_the_fittest.pdfIn PDF document text
    • https://b304dada-1952-41b2-af44-d16a3232bb3f.filesusr.com/ugd/c19c34_60e234e61ac94f6a8f2a12170ebddb61.pdf?index=trueIn PDF document text
    • https://bef89f6e-6323-4b84-ad9d-a44490bfcc4f.filesusr.com/ugd/96768c_2400de19187e4b6194611e03a608b17a.pdf?index=trueIn PDF document text
    • https://5c90cfa9-af55-48e2-9430-1f3580382729.filesusr.com/ugd/e2b09b_f6517ddb4b504084bd2cfb7e82a534c1.pdf?index=trueIn PDF document text
    • https://6f84c080-6bd2-4154-8ce1-0e390380bda5.filesusr.com/ugd/defdb4_d73abb15372048e496af9bc1255b901b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2229385e-b3d4-4dc7-81dc-6326ee3e9a95/is_after_we_collided_a_sequel_to_after.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/58586ab6-8c50-47d1-9732-0aea0f9d914f/49109533181.pdfIn PDF document text
    • http://mijunuwe.epizy.com/very_rare_forever_freestyle.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_off000129d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129D8 5092 bytes
SHA-256: 30a85e85083029e53e7c0fe0d37caea5f74f7f2c50edcc48915f4e20cea741b5
font_01_sfnt_off00013b4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B4C 13428 bytes
SHA-256: 4b7923c8883272f3a3cb2631315be028bcc429162b5d3431883a7a94275defe4