Malicious PDF — malware analysis report

Static analysis result for SHA-256 655364989751aa31…

MALICIOUS

PDF

88.9 KB Created: 2021-03-30 22:42:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 96a51be3fd44aac10bbb0aeaa8880980 SHA-1: 4e79205bebcebd09b2872c42dcec34924759a2eb SHA-256: 655364989751aa316c15d29ea59c40d04058de40ddac7864e9bc4e8142199342
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with one prominent URL pointing to 'baarspo.ru' which is likely part of a phishing or malware distribution scheme. The PDF structure and embedded content suggest it functions as a link farm designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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
  • 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://baarspo.ru/strik?utm_term=skin+so+soft+uses+avon PDF link annotation
    • https://zigamebujadosa.weebly.com/uploads/1/3/4/7/134745820/jadozatos.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459323/normal_6062ef9d484e6.pdfIn PDF document text
    • https://ruwevupezo.weebly.com/uploads/1/3/4/0/134013147/xaxofizuzurolepuwug.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416934/normal_5fee46ff3cd38.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475215/normal_5fd1146bbf9bb.pdfIn PDF document text
    • https://putavoguxula.weebly.com/uploads/1/3/5/3/135325624/4645920.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403683/normal_6012848791aaa.pdfIn PDF document text
    • http://criticcxck.space/hitchhikers_guide_to_the_galaxy_ebook6y5at.pdfIn PDF document text
    • http://meetsucre.pro/electrical_theory_and_application_for_hvacrxwcxp.pdfIn PDF document text
    • https://faxipanonuk.weebly.com/uploads/1/3/4/3/134352952/6587541.pdfIn PDF document text
    • http://velavedi.iblogger.org/weather_report_west_des_moines_iowa.pdfIn PDF document text
    • https://zugixipenelir.weebly.com/uploads/1/3/4/5/134591811/988256.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409420/normal_5fe428e9812c0.pdfIn PDF document text
    • http://olymptrade.buzz/red_rising_lgbt_charactersrk6mq.pdfIn PDF document text
    • http://arendaavto.taxi/anthropology_textbook_download8ssr5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/nazekisigiduz/left_displaced_abomasum.pdfIn PDF document text
    • http://wanezezigemos.rf.gd/parubovuropudisonof.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b8272e0f-6202-4570-9e44-ae6a90b90767/rowipo.pdfIn PDF document text
    • https://s3.amazonaws.com/ganubifirigevi/70950522426.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b08dae67-7ab7-4e6e-9694-77793ca4682b/bojedekiwemubuz.pdfIn PDF document text
    • https://s3.amazonaws.com/tajimipojimo/pixalun.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1dd70595-be0b-4384-bd9c-18c67d4ce8c7/30640664909.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b36e210-f558-46b4-af59-cb75b394e400/26839134416.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a49e2e45-c54f-49fd-a614-564f5d89b6e4/how_much_can_a_2004_ford_ranger_xlt_tow.pdfIn PDF document text
    • https://s3.amazonaws.com/kiguteperilodu/sizujivexipipagekujajanax.pdfIn PDF document text
    • https://s3.amazonaws.com/vososasoxumete/dinosaur_bone_worksheet.pdfIn PDF document text
    • http://sipikoz.epizy.com/pavusiwowolubojaxag.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010a12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A12 4860 bytes
SHA-256: cd51a0ee80db22babe41c1fc4c0cb5edd705d77b13242e8bacde18fdec8703a3
font_01_sfnt_off00011abc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ABC 11220 bytes
SHA-256: 4c610a6811a602ebaa0b251fa0b9c5c1770aa710253393761121447bab9d815a
font_02_sfnt_off0001411a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1411A 16060 bytes
SHA-256: 5b0d2701ab39d2f69c66d7d16c60d8db0b323aa0832947137e757b5401d27330