Malicious PDF — malware analysis report

Static analysis result for SHA-256 11ffc5e568b92df9…

MALICIOUS

PDF

70.6 KB Created: 2021-06-11 19:16:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 28d5f748dd20b50e26ba2bdf75ab7d7d SHA-1: e58fb52bc2464ae4115feda83ef292527d6fb51f SHA-256: 11ffc5e568b92df97b152ddbfd91230dd9db55bf9e2a7a6d721b4048f0232352
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 0.9998

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://infrive.ru/pbw?utm_term=among+us+v21+hack PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4427282/normal_5fd095e695088.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495531/normal_60679660aa796.pdfIn PDF document text
    • https://bejejedagaf.weebly.com/uploads/1/3/4/8/134862385/2105610.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404953/normal_5ff513894f94d.pdfIn PDF document text
    • https://dirotigakavomak.weebly.com/uploads/1/3/4/2/134235834/9431137.pdfIn PDF document text
    • https://pezilesuwubev.weebly.com/uploads/1/3/4/6/134639222/zisumod_nixewi_xavamekugiteg.pdfIn PDF document text
    • https://wodedofa.weebly.com/uploads/1/3/4/3/134320626/jujovorekejoniv_vapope.pdfIn PDF document text
    • https://wivapofeselaf.weebly.com/uploads/1/3/5/3/135317026/bakutozigovemomeve.pdfIn PDF document text
    • https://kewoloxonesafuf.weebly.com/uploads/1/3/1/6/131606745/9394613.pdfIn PDF document text
    • https://kesesitevon.weebly.com/uploads/1/3/5/3/135317357/94691.pdfIn PDF document text
    • https://jipagulus.weebly.com/uploads/1/3/1/3/131379543/5538506.pdfIn PDF document text
    • https://minesipapotevu.weebly.com/uploads/1/3/4/1/134108733/6631877.pdfIn PDF document text
    • https://riwinuwozobama.weebly.com/uploads/1/3/4/8/134868589/puseluponemo_ropalabewul_pumeweli_zufuviz.pdfIn PDF document text
    • https://ledegukumimajem.weebly.com/uploads/1/3/5/3/135393042/felodipinod_nekewovoduw_tekezi_tuvovoxafep.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405638/normal_602cdce1a88c6.pdfIn PDF document text
    • https://mirujodafepofon.weebly.com/uploads/1/3/4/7/134707115/8820362.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388289/normal_603f6c10e6b0f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bofamawetodo.pbworks.com/w/file/fetch/144445020/filmywap_south_movie_2018_hindi_dubbed_download.pdfIn PDF document text
    • http://palixazoke.pbworks.com/f/how_does_the_death_of_the_scarlet_ibis_foreshadow_the_death_of_doodle.pdfIn PDF document text
    • http://gaxoxim.pbworks.com/f/basisvaardigheden_academisch_schrijven_samenvatting.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_off0000d683.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD683 5384 bytes
SHA-256: c6956fabf6ed53bc37f9cf6f84d9d786fd0242eccf9c26cc8bd913764099ccac
font_01_sfnt_off0000e8c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8C3 10832 bytes
SHA-256: 379b5442762ae8f9c39fcf99e0a99e649e020a6e5d51be7d4f53ffa27ac440e6