Malicious PDF — malware analysis report

Static analysis result for SHA-256 c03247a6fe560551…

MALICIOUS

PDF

75.2 KB Created: 2021-03-01 15:42:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 41ceecbadaa1d86e917665e5e6336679 SHA-1: 1967f85c00fb461572bbe3973ad553a52135d528 SHA-256: c03247a6fe56055127f3fbff68a58f4e97f1c9d89f6a0db6d40979c48baabef0
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one heuristic specifically identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were extracted, the presence of many external URIs suggests an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://resalured.ru/wb?keyword=dunkin%20donuts%20ingredients%20donut%20holes PDF link annotation
    • https://cdn.sqhk.co/sizafutito/gggcigf/indy_500_pics_2019.pdfIn PDF document text
    • https://cdn.sqhk.co/kevekelobivo/WggHjT3/26117903862.pdfIn PDF document text
    • https://cdn.sqhk.co/tivinarafuvu/halidjd/17970872716.pdfIn PDF document text
    • http://pixidilivutep.medianewsonline.com/what_does_technical_drawing_meaning.pdfIn PDF document text
    • http://opssmall.space/photo_id_card_template_free_online6lnxr.pdfIn PDF document text
    • https://cdn.sqhk.co/madufuxenuw/FgiIhjM/island_of_the_blue_dolphins_summary_chapter_2.pdfIn PDF document text
    • http://electorat.org/17557921793vr0te.pdfIn PDF document text
    • http://figimumagoko.mygamesonline.org/awol_guidelines_philippines.pdfIn PDF document text
    • http://kogemotuju.getenjoyment.net/the_ugly_american_full_movie_youtube.pdfIn PDF document text
    • http://vetobiz.sportsontheweb.net/gawam.pdfIn PDF document text
    • https://cdn.sqhk.co/jomutepe/PgjghOI/big_rig_racing_game_cheat_codes.pdfIn PDF document text
    • http://brandframeb.com/friends_album_song_video_mp4tl29h.pdfIn PDF document text
    • http://fakixigulidol.mywebcommunity.org/96571981050.pdfIn PDF document text
    • https://cdn.sqhk.co/gevagedubop/E9hgjgR/pico_rivera_sports_arena_covid_testing.pdfIn PDF document text
    • https://cdn.sqhk.co/juxajomuz/IhhSzgf/35187037638.pdfIn PDF document text
    • http://yazansoft.com/589822103849fo48.pdfIn PDF document text
    • http://vozivovog.scienceontheweb.net/vedic_maths_tricks_download.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jokosen.atwebpages.com/replacement_parts_for_total_gym.pdfIn PDF document text
    • http://pusapovewazigu.onlinewebshop.net/what_is_the_difference_between_viral_and_bacterial_tonsillitis.pdfIn PDF document text
    • https://s3.amazonaws.com/wudibirewuduto/autograph_full_movie_tamil.pdfIn PDF document text
    • http://doriponesarom.myartsonline.com/waterpik_water_flosser_plus.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_off0000ea61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA61 4940 bytes
SHA-256: 22803b23e5479a67befd1d3bf2f2169d63be4d55d53af1bb1400a97368892e8f
font_01_sfnt_off0000fb31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB31 10504 bytes
SHA-256: b75723295ee309f7608bb42cf936d03228206faa8f5084dc59c43e6f58a783ae

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