Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1c42254630330a2…

MALICIOUS

PDF

77.9 KB Created: 2021-05-01 01:51:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9269b1bf38878999b27ec6a318422e81 SHA-1: 746bb632b7a2287106f1026377ee9670aace5864 SHA-256: f1c42254630330a205f5401a7c4c1d87c69a4f54c909fd36aee7634a15d6ff8c
156 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many of which are hosted on dynamic DNS services or file-sharing platforms, suggesting a link farm or phishing attempt. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards the exploitation of PDF vulnerabilities or social engineering to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://dafemum.ru/strik?utm_term=kidde+fire+alarm+2+beeps
    • https://nopefulewipedu.weebly.com/uploads/1/3/4/3/134314682/paxewiroke.pdf
    • https://finolija.weebly.com/uploads/1/3/4/6/134625313/zopomefud.pdf
    • https://dusomekekonipa.weebly.com/uploads/1/3/4/5/134580960/5789960.pdf
    • https://visoxifa.weebly.com/uploads/1/3/2/7/132740860/5195132.pdf
    • http://tebepif.22web.org/convert_large_to_word_doc_free.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/4fc292dc-3b83-467c-a106-cd4e668b4850/59048636025.pdf
    • http://tatugenugefudef.epizy.com/zatipumumijorutovosip.pdf
    • https://s3.amazonaws.com/zuxime/introduction_to_computer_vision_nyu.pdf
    • https://s3.amazonaws.com/pegozegi/ralakuteposevirimon.pdf
    • https://uploads.strikinglycdn.com/files/de5c2b46-ad8d-40f7-981b-e3a8b10e154c/easy_ukulele_songs_for_beginners_play_along.pdf
    • https://uploads.strikinglycdn.com/files/5eb00067-f4df-40d5-8833-83d8e10b4e24/craftsman_dyt_4000_drive_belt_size.pdf
    • http://puvusevakap.epizy.com/91139193636.pdf
    • https://uploads.strikinglycdn.com/files/d556f020-ed69-44fa-97fa-6cb5184be7a1/mesa_boogie_mark_iv_head_review.pdf
    • https://uploads.strikinglycdn.com/files/bc9d1a5e-33b7-4687-9677-52db247bd802/yoga_poses_for_constipation_and_bloating.pdf
    • https://uploads.strikinglycdn.com/files/701e5804-d1d6-4db4-9e44-8d738c8693f9/vumuridiwavuwepamesaba.pdf
    • https://s3.amazonaws.com/guwutivupudutu/xbox_360_controller_button_jammed.pdf
    • https://uploads.strikinglycdn.com/files/ac386110-8215-4843-8cd2-98785900183c/walmart_black_friday_11_14_hours.pdf
    • https://uploads.strikinglycdn.com/files/0809d1f1-b5c5-44de-a247-efc29fcf9b4f/power_cooker_8qt_pressure_cooker_manual.pdf
    • http://munekekenagixo.rf.gd/gedebif.pdf
    • https://uploads.strikinglycdn.com/files/889cddc5-d6ca-47ef-88c3-dfa3bf3ee901/how_to_fix_a_shop_vac_switch.pdf
    • https://uploads.strikinglycdn.com/files/88c9932c-8951-4cfe-9932-f0f7c9fdcf54/cuantas_tazas_de_harina_son_700_gramos.pdf
    • http://gidovofivoj.epizy.com/gijerimufirijipom.pdf
    • https://uploads.strikinglycdn.com/files/24ec6f55-f34f-441c-b44a-b9722c8b983c/the_secrets_we_keep_trailer_subtitulado.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f235.bin
4ed41f1fe3c1aa817d2ae3a6a107f7e52358dd27ace3cc055b257e8dbe6d6456		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF235 5428 bytes
font_01_sfnt_off00010496.bin
16cdc42541a7a9a2701828488b712b0ff946b949a178c56bba6a2d3113549153		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10496 11288 bytes

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