Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b068232052722e9…

MALICIOUS

PDF

70.5 KB Created: 2021-04-04 07:42:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 1a46308a30809e202984b830e972d316 SHA-1: 3e4321349d4a3d3b75379d356a8782e973bfa721 SHA-256: 0b068232052722e9ae1098bc4957af0ac599d69152ffb2e548c721053e35016a
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a significant portion pointing to disposable hosting and exhibiting link farm characteristics. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically phishing. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://midufefew.ru/123?utm_term=bogan+movie+whistle+tone PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4403556/normal_6057066581198.pdfIn PDF document text
    • http://rastet-malysh.ru/what_size_battery_does_my_armitron_watch_takeo4dgp.pdfIn PDF document text
    • http://opendouche.xyz/modelos_de_inventarios_deterministicos_y_probabilisticos_ejemplosrastx.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485696/normal_6023da479fa53.pdfIn PDF document text
    • http://gimogorox.22web.org/fletching_guide_osrs_2018.pdfIn PDF document text
    • http://cmb-accueil.com/how_long_does_it_take_to_read_the_wheel_of_time_serieshhegw.pdfIn PDF document text
    • http://bhd-management.space/vunuguk32zg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478927/normal_60353f8fa3b3f.pdfIn PDF document text
    • http://revershjtb.site/99665973965s39w6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444657/normal_6041cbcd15f4a.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/fifuto/abel_korzeniowski_sheet_music.pdfIn PDF document text
    • http://vebaxabono.epizy.com/solving_exponential_equations_using_logarithms_worksheet_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/masevewi/bihar_daroga_question_paper.pdfIn PDF document text
    • https://s3.amazonaws.com/nuruvapozixix/fililekiviw.pdfIn PDF document text
    • http://nerebadaguve.epizy.com/bahubali_2_picture_kare.pdfIn PDF document text
    • http://dolapipikafaf.rf.gd/vixutoxofizamitukudeb.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cdf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDF8 5204 bytes
SHA-256: c1711d1dde40b6d3ca929b7fe1237f25e2b716a1c6bfe2b3bbbc5b70be9157f3
font_01_sfnt_off0000df9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF9B 2116 bytes
SHA-256: 1f756b46481ac718095810e133e155ec1caf818687d25c20e8b002f727d713c7
font_02_sfnt_off0000e947.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE947 10232 bytes
SHA-256: f808a1e3f387e08a74618335009b4e8c337bb4b36a9613d0cda0e055668741d7

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