Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcc01da43f217489…

MALICIOUS

PDF

80.5 KB Created: 2021-02-02 09:46:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 3835a6008990560f0ed416f2c948e6dd SHA-1: abd8d7ec084572e981c38c5a17013c18b70b806c SHA-256: dcc01da43f217489a80a0336bb1757b026013ff10539a5f44c5a8c7cab9d9424
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious sites. The document body, though heavily obfuscated, appears to be a lure related to 'crab rave piano sheet music pdf', likely to trick users into clicking the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • 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.
  • 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://leonvi.ru/aws?utm_term=crab+rave+piano+sheet+music+pdf PDF link annotation
    • https://japapitamamevoj.weebly.com/uploads/1/3/2/7/132740309/guzolavafixuta_ritebipoj_biduzek.pdfIn PDF document text
    • https://wisowoturap.weebly.com/uploads/1/3/1/4/131453432/vinosivoluz_tezagi_moxajufu_tolomufegozidop.pdfIn PDF document text
    • https://cdn.sqhk.co/jogekiluse/icxOjeL/drumstick_ice_cream_cereal.pdfIn PDF document text
    • https://nogiwesetegi.weebly.com/uploads/1/3/1/6/131637024/7107509.pdfIn PDF document text
    • http://medupaj.iblogger.org/achievement_hunter_team_names_spreadsheet.pdfIn PDF document text
    • https://cdn.sqhk.co/janawezexoj/L2jdjgK/bubble_shooter_games_offline_download.pdfIn PDF document text
    • https://cdn.sqhk.co/naveropifo/hiMPbAs/pencil_box_plastic_pouch.pdfIn PDF document text
    • https://cdn.sqhk.co/tevunufoba/hUcoovv/semi_tractor_pull_fails.pdfIn PDF document text
    • https://cdn.sqhk.co/kelopifagisu/pjh1Qhj/8153109208.pdfIn PDF document text
    • https://zopodiwozexuma.weebly.com/uploads/1/3/4/7/134737972/doragimivibiw.pdfIn PDF document text
    • https://cdn.sqhk.co/wogokodu/j6kihhd/45403282142.pdfIn PDF document text
    • https://cdn.sqhk.co/wazofelagi/Eijjfgi/matomajefabupebejesoviwek.pdfIn PDF document text
    • https://cdn.sqhk.co/benibavagoge/Iihjdw9/21550575976.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://xusoloturokuk.epizy.com/81803176405.pdfIn PDF document text
    • https://s3.amazonaws.com/sigobija/converting_percents_to_decimals_to_fractions_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/xakusineba/dubai_tour_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/falejogajir/24031309365.pdfIn PDF document text
    • http://buvodadixasiz.epizy.com/18100802508.pdfIn PDF document text
    • http://gagonunanu.epizy.com/how_to_upgrade_android_box_firmware.pdfIn PDF document text
    • https://s3.amazonaws.com/nuxulikiwab/diccionario_biblico_hebreo_espaol_gratis.pdfIn PDF document text
    • https://s3.amazonaws.com/firigugixujotov/befakesonijogane.pdfIn PDF document text
    • https://s3.amazonaws.com/nefomojuwet/dinufijeruzi.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_off0000ef66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF66 5468 bytes
SHA-256: 88e8d2548cce4b99eb1ff2588a437242ebeb78aebc402ce281a82162b8e30b32
font_01_sfnt_off000101ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101CE 10628 bytes
SHA-256: 19527055a566ee5d0e83aeb2dffcc33e4cf692d4b0d0a37c6dbee63447f6ca60
font_02_sfnt_off000125f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125F9 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176