Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9e85e1024cca61e…

MALICIOUS

PDF

81.4 KB Created: 2021-02-15 11:55:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 1f94955de506a7d922bd5110aebb78d9 SHA-1: a0dc59b2396702eef962afc188db720738b1ba69 SHA-256: b9e85e1024cca61e30aacaba5fee5badf00ff4e7d6c3e6066e0131376eccbffa
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of numerous external links and a heuristic firing for a 'link farm' suggests an attempt to manipulate search engine results or redirect users to malicious sites. The 'LOLBin run command' heuristic and the embedded URLs point towards a potential exploit or download mechanism, likely involving the execution of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 http://uablog.website/kenowofewrh39.pdf In PDF document text
    • https://cdn.sqhk.co/verexoleki/bYhiihD/logo_quiz_answers_level_60.pdfIn PDF document text
    • http://inmyshtangen.xyz/tujidiwugoxavuwagbiyg8.pdfIn PDF document text
    • https://cdn.sqhk.co/zazifutunoj/exicpyQ/12895226877.pdfIn PDF document text
    • https://cdn.sqhk.co/fewukise/6iejjox/can_i_stream_nbc_sports_bay_area.pdfIn PDF document text
    • https://cdn.sqhk.co/gobuwovuv/Yggzyhj/curling_3d_apk_mod_diamond.pdfIn PDF document text
    • https://cdn.sqhk.co/fuwunikuneg/jiVyifo/elements_massage_scottsdale_arizona.pdfIn PDF document text
    • http://prizinsta365.site/57476744295bnoz2.pdfIn macro / runtime command snippet
    • https://cdn.sqhk.co/juzurupivepo/fh4RPLH/find_five_below_store_near_me.pdfIn PDF document text
    • http://yoga-italy.space/open_vcf_file_androidkliau.pdfIn PDF document text
    • https://cdn.sqhk.co/nilesatu/j1TRnot/mod_lamborghini_car_mechanic_simulator_2018.pdfIn PDF document text
    • https://cdn.sqhk.co/bitaxukezor/idpBiec/minerva_mcgonagall_cat.pdfIn PDF document text
    • https://cdn.sqhk.co/figesuweno/mlQgd6A/trench_definition_world_geography.pdfIn PDF document text
    • https://cdn.sqhk.co/tajiwikiter/ibhdDgc/sniper_3d_assassin_shoot_to_kill_download.pdfIn PDF document text
    • https://cdn.sqhk.co/netimupoxojo/CSsWHjf/this_is_the_police_2_walkthrough_tactical_missions.pdfIn PDF document text
    • https://leonvi.ru/wb?keyword=hp%20ultraslim%20docking%20station%20displayport%20PDF link annotation
    • https://cdn.sqhk.co/fuwunikunIn macro / runtime command snippet
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/dugibabafod/xokud.pdfIn PDF document text
    • http://bojefej.epizy.com/ready_answer.pdfIn PDF document text
    • https://s3.amazonaws.com/belopudevuzuza/daily_astroguide_deccan_chronicle.pdfIn PDF document text
    • http://nibudomatimemi.rf.gd/lab_technician_cover_letter_templates.pdfIn PDF document text
    • https://s3.amazonaws.com/tupofelasujewas/84058780616.pdfIn PDF document text
    • https://s3.amazonaws.com/wifiduxezo/nafodidijipexovesamil.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_off0000f024.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF024 3080 bytes
SHA-256: 0fcef192c95d6fd4d5333de3e5f0a04c8525a73f6e29f4febd37223f58d6e746
font_01_sfnt_off0000fb2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB2D 6412 bytes
SHA-256: 723baa1376a3a35f58408c3fa952c8fd8b4abca5718a1b5bb5fb60dd3aa88340
font_02_sfnt_off000110fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110FC 11044 bytes
SHA-256: f94a103c64c769e67a8fb921435e1eb4a03e5735a0f4c77931b94f37aa786f39