Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc468487fbda491d…

MALICIOUS

PDF

79.8 KB Created: 2021-03-23 07:49:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: c68e41057609298caf69318949604af6 SHA-1: f252c8f01bb4385e0e07a8cb119b74e752e06e87 SHA-256: bc468487fbda491dac71268a5d369544758e377c8f2cde03a4c79ad121ab5875
156 Risk Score

Malware Insights

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

The PDF file is identified as malicious by multiple heuristics, including a critical ClamAV detection and an ML classifier flagging it as phishing. It contains a significant number of external links, suggesting a link farm or redirection mechanism. The document body, though partially corrupted, indicates a 'worksheet' lure, which is a common social engineering tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 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.
  • 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://druttle.ru/123?utm_term=converting+hex+to+decimal+worksheet PDF link annotation
    • http://luderoniripola.iblogger.org/97671792599.pdfIn PDF document text
    • https://cdn.sqhk.co/kinemefuwa/FzlUKii/36801222688.pdfIn PDF document text
    • https://cdn.sqhk.co/gegojagakexu/diegj7C/bullet_force_free_download_for_android.pdfIn PDF document text
    • https://cdn.sqhk.co/tajiwikiter/ehajaLm/musica_italiana_2020_nuove.pdfIn PDF document text
    • https://cdn.sqhk.co/bimazizuxu/NBcjeZl/povokivafikajori.pdfIn PDF document text
    • https://cdn.sqhk.co/bijowiroma/gMhefjf/pola_camera_beauty_selfie_apk.pdfIn PDF document text
    • http://japadalifu.22web.org/best_inorganic_chemistry_book_for_jee_mains.pdfIn PDF document text
    • https://cdn.sqhk.co/dekavaka/hhhdKKV/67787377948.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/sukobogixe/73067300851.pdfIn PDF document text
    • https://s3.amazonaws.com/rabewiruzitewa/fowurafutinenolu.pdfIn PDF document text
    • https://f62823ea-e863-4eb7-bd7c-e3bac0139ff1.filesusr.com/ugd/8c639a_0258074833db4e399f770b828f952846.pdf?index=trueIn PDF document text
    • https://891dfe3a-8969-4df2-b253-5ccc4ebbb7a0.filesusr.com/ugd/e66789_48a6da004d8143a2bf7c615e8d48258c.pdf?index=trueIn PDF document text
    • https://a49aa754-465e-4bbd-924e-b3d0e7b66bd4.filesusr.com/ugd/81d6a4_c5ecd1a47ba048cca3f7fc0124ffc7fb.pdf?index=trueIn PDF document text
    • https://9e1e9198-0fe7-4103-8084-fdcc6befb8d5.filesusr.com/ugd/2f7815_5baf7dd92f954e6993b19205b98f37ea.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xomepixo/predicting_ionic_charges_worksheet_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/bededuxotulapil/yann_tiersen_la_dispute_piano_sheet_music.pdfIn PDF document text
    • https://f7b0ef4b-317e-4f07-901b-4de91a029b50.filesusr.com/ugd/50f142_6dcb34e059e84d30962f979f5f955a37.pdf?index=trueIn PDF document text
    • https://ecf8b3bd-8201-449f-a39c-156acd88681e.filesusr.com/ugd/97634b_3f47338330e24a91abc0108b888dc937.pdf?index=trueIn PDF document text
    • http://fukijudetoj.epizy.com/algorithme_informatique_tcs.pdfIn PDF document text
    • https://ac25a69f-a984-4293-9c3d-8c9e0f062535.filesusr.com/ugd/cbf077_6d63717a12be42eea76c0fcccdf979fd.pdf?index=trueIn PDF document text
    • https://968bac2e-1409-45a7-bd11-2c37eba47390.filesusr.com/ugd/c81504_6961f9ef227e4cc0bfbd63e0d70d3ad0.pdf?index=trueIn PDF document text
    • https://19527f6f-7821-4b33-8e58-d909ab9a203f.filesusr.com/ugd/b18fc6_a3fe80dcea50454aaefd7891dc586fcc.pdf?index=trueIn PDF document text
    • https://9a4b5e96-23fe-4021-9525-787506808755.filesusr.com/ugd/b3318b_df1b6ebad88d4f2f876f46e9b4e70c2f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nademopor/vawigudaseduwanuf.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_off0000ee11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE11 3080 bytes
SHA-256: 3ea9dc0fe5daeba8b7c1286de8752a991578e51b79301a8010be3d8f06b4997c
font_01_sfnt_off0000f919.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF919 5544 bytes
SHA-256: c350207579542db07abd61c7b5e588b1ca8d8e7faa1846cac731a5af4734458a
font_02_sfnt_off00010bda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BDA 10996 bytes
SHA-256: 389965527f1db108ecb9c3b35179eb77ce3e11c34d33e606f7ffc5a717d0b559