Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2521c77b3a2c542…

MALICIOUS

PDF

77.0 KB Created: 2021-03-31 08:14:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: e132704cfcaea5cb690c8b0414eda174 SHA-1: 245ccea31fc404a382ae5681c02deb480dd088dc SHA-256: b2521c77b3a2c5428ab452bcefac2c5e4152a8e51b480245f2721210786f498c
166 Risk Score

Malware Insights

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

The sample was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of numerous external URIs, many hosted on disposable domains, suggests a link farm or phishing operation. The heuristic 'SE_LOLBIN_RUN_COMMAND' firing with 'powershell_command_prompt_windows_7.pdf' suggests an attempt to execute commands, likely to download and run a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://dugedepap.ru/award?keyword=audio+power+amplifier+design+pdf+download PDF link annotation
    • https://xolufoxe.weebly.com/uploads/1/3/4/5/134501271/budanivolovub.pdfIn PDF document text
    • http://kozidozilujivox.getenjoyment.net/fezetenararelokomiba.pdfIn PDF document text
    • http://tubixiwuwura.iblogger.org/zukazilinodode.pdfIn PDF document text
    • https://kawawipebezuvo.weebly.com/uploads/1/3/1/4/131409621/vifekokazajovebosene.pdfIn PDF document text
    • http://dajexori.mypressonline.com/how_to_use_bosch_pocket_scan_obd_1000.pdfIn PDF document text
    • http://futajef.medianewsonline.com/biography_of_chinua_achebe.pdfIn PDF document text
    • http://dotekebenutedex.scienceontheweb.net/20_amino_acids_structures_and_names.pdfIn PDF document text
    • https://zuwadakake.weebly.com/uploads/1/3/4/6/134664894/bb6949c9.pdfIn PDF document text
    • http://manamuposa.getenjoyment.net/lady_midnight_characters.pdfIn PDF document text
    • https://suruwizad.weebly.com/uploads/1/3/4/7/134766156/ridujumade_lepukirekam_vijut_firafud.pdfIn PDF document text
    • http://fabofid.22web.org/fusionner_plusieurs_en_1_document.pdfIn PDF document text
    • http://nazixoja.iblogger.org/61966657769.pdfIn PDF document text
    • https://suxegetolikas.weebly.com/uploads/1/3/4/0/134097713/4b5c4ad787.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lesexuxu.rf.gd/94025302815.pdfIn PDF document text
    • http://nexopuvesoreben.epizy.com/magisterial_district_courts_docket_sheets_new_jersey.pdfIn PDF document text
    • http://pofitubawonu.atwebpages.com/cbse_class_12_accountancy_textbook.pdfIn PDF document text
    • http://ralirajuz.atwebpages.com/phonetic_alphabet_usa.pdfIn PDF document text
    • http://tuxefofoxomar.epizy.com/andrea_camilleri_books.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2debc23-4b2b-4bcf-9dda-63f608fa7397/what_kind_of_cost_is_indirect_labor.pdfIn PDF document text
    • http://galisatuvuvos.rf.gd/predator_4000_generator_parts_list.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f362cb26-2337-475b-9dd7-20e1303c0bb3/super_mario_3d_land_walkthrough_world_2-3.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1558ff3e-e6a6-4214-aeb3-1e2028ffab8d/powershell_command_prompt_windows_7.pdfIn PDF document text
    • http://baduvebeketuwo.epizy.com/7363273894.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED5A 5444 bytes
SHA-256: 54be63368b4fb5eba2678d92cf00a1c43d1af2f65fed5fd9b8b30e06ae61ed8f
font_01_sfnt_off0000ffd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFD7 11176 bytes
SHA-256: 3ffc60e5a332f919f3c3b3bb14c89c3cda8c39b4bec092629ca1d66bb281d522