Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c18639f36ba750b…

MALICIOUS

PDF

80.6 KB Created: 2021-03-10 14:36:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: e5bd7b67f7358405a067aea46c8e172e SHA-1: ab891feea2b8a579392e2a98e315d06acb273405 SHA-256: 1c18639f36ba750b52c3b65cda9b60129301c0610d8673f0e53ef72c5588c219
126 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier, indicating malicious intent. It contains numerous embedded URLs, many pointing to disposable hosting or link farms, suggesting a phishing or malware distribution scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically highlights the nature of these links, which are designed to attract traffic and potentially lead users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://bologen.ru/award?keyword=bartok+mikrokosmos+vol+3+pdf PDF link annotation
    • https://cdn.sqhk.co/konajera/jfcWgcH/ice_age_village_ios_cheats.pdfIn PDF document text
    • http://makedctl.site/520948853332eazk.pdfIn PDF document text
    • http://segowesilo.iblogger.org/format_carton_d_invitation_word.pdfIn PDF document text
    • http://instofficial.online/97134152807ouvd7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386613/normal_5fcdf577c917f.pdfIn PDF document text
    • http://blankid.ru/why_dark_knight_joker_is_best9np8z.pdfIn PDF document text
    • https://cdn.sqhk.co/sanozusu/d0eTjbn/29907188594.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470402/normal_6022d7c292970.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4499972/normal_5ffe61ebcc566.pdfIn PDF document text
    • https://cdn.sqhk.co/goberirud/chfidgf/smart_balance_buttery_sticks_vegan.pdfIn PDF document text
    • https://cdn.sqhk.co/dedikunakudu/jja9uw4/worksheets_on_abstract_nouns.pdfIn PDF document text
    • https://cdn.sqhk.co/kuxefoxo/icljh8o/chennai_city_gangsta_hd_video_song_download.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/a9be83d5-cbba-4021-a449-ad7d9103ced2/xirexoxinoboje.pdfIn PDF document text
    • http://fidobagasamos.epizy.com/99714104572.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2303b3b-6f96-4532-be5f-d161aab2eb3c/how_do_i_hook_up_my_vizio_sound_bar_to_my_tv.pdfIn PDF document text
    • http://lumulexidavotaj.epizy.com/troy_bilt_2800_pressure_washer_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f527700b-f225-4d4d-a8bc-ccb1d65f0499/dagixenakirurelagipop.pdfIn PDF document text
    • http://pupudewasoxo.epizy.com/74306240629.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/56f8c470-25e7-4fa2-8639-b95bae572a30/gilawinefitajuwamikoxeb.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9BD 5524 bytes
SHA-256: 4ef6e6deb84bfaa985cf863a97fa6424c448b826f97ee37555818c08ba8a9058
font_01_sfnt_off0000fc7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC7B 10116 bytes
SHA-256: bf3188bb6ed08e00cdfbf23675ce9fd08c6fabff6007d46f03d9231fd462a162
font_02_sfnt_off00011f6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F6A 16184 bytes
SHA-256: 6932df4cb72b4efe2770651eeca670529029c4438adefa4b71cf057b6e4d930a

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