Malicious PDF — malware analysis report

Static analysis result for SHA-256 65f35c19fb5c9a6c…

MALICIOUS

PDF

79.7 KB Created: 2021-03-29 16:41:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 4e39e21e9470d457c417565fde45b2ff SHA-1: 145f84ea40344acae72ac677d3a9937c515c1eff SHA-256: 65f35c19fb5c9a6c355c0ba74d0e83adfe18e31b42907237012bca1df7177087
134 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, directing users to various PDF downloads, with one primary URL pointing to a suspicious domain. The document body, though heavily obfuscated, contains keywords related to free downloads, reinforcing the lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://pelibifir.ru/award?keyword=shrimad+bhagwat+geeta+in+bengali+pdf+free+download PDF link annotation
    • http://vpntop.info/4553399323j2mx6.pdfIn PDF document text
    • https://cdn.sqhk.co/rigizisojix/gcP8unC/32222350169.pdfIn PDF document text
    • https://cdn.sqhk.co/nuditufu/haAhfhg/boss_tu_3_tuner_true_bypass.pdfIn PDF document text
    • https://cdn.sqhk.co/lewikokezina/ejh4Zjh/jump_ninja_trampoline_park_salford_m5.pdfIn PDF document text
    • https://cdn.sqhk.co/gilubibawi/iafRZgh/pixel_dungeon_mod_apk_android_1.pdfIn PDF document text
    • http://tiktokcopyrighthelpteam.com/danby_premiere_dehumidifier_manual_ddr70b3wpgloo4.pdfIn PDF document text
    • http://findfreegirl.com/uniform_distribution_graph_in_matlabqmuyf.pdfIn PDF document text
    • https://cdn.sqhk.co/zevinikiwi/HtFTxic/frases_tumblr_cortas_para_fotos.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407986/normal_5ffca3131a806.pdfIn PDF document text
    • https://cdn.sqhk.co/geroterunetu/hjT0A3k/totok_app_apk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413011/normal_5fd0d5bfd1b57.pdfIn PDF document text
    • https://cdn.sqhk.co/rewanizotaj/eggihhd/14577798381.pdfIn PDF document text
    • http://hermidkovo.info/body_for_life_exercise_programyn1xq.pdfIn PDF document text
    • https://cdn.sqhk.co/nogawevorus/PagjhbV/technical_writing_course.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/vesubodufisi/31934494903.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a2c1163d-e07e-49e9-adcb-ba36b9f62568/30561478330.pdfIn PDF document text
    • https://s3.amazonaws.com/visagogijulep/how_to_study_for_step_1_in_2_months.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a499c3c-d966-469f-8465-37f04019102c/new_yorker_magazine_cover_next_week.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba672d23-ffc7-400e-a4fa-d1d30b910794/is_6_figures_a_lot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/674512f6-dc0b-4d90-af57-17aab8c0af6c/daben.pdfIn PDF document text
    • https://s3.amazonaws.com/wovisak/dofenifimajagumukugifo.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://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA52 5612 bytes
SHA-256: 2ba0efb28e39ad4c33634908c95d87d24c2de89ed136165218832b4eb84f0be8
font_01_sfnt_off0000ed49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED49 10720 bytes
SHA-256: 147c3c8d87d352d2fc42d844ae5680e1ae4ebcf92af85b4ecba10dc2735e15a8
font_02_sfnt_off00010c98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C98 10488 bytes
SHA-256: e1af066bddfa56f7a94c20d6e8e91d9b96c31b6c78bad4c10ac828c2b6d49f3f