Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b89aa7c7b4c5830…

MALICIOUS

PDF

87.2 KB Created: 2021-03-14 07:51:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 79d4b372aac1e6f1cfb6e10910081e26 SHA-1: 32de639f23974419fe72b0e9a68a381f19cc5b98 SHA-256: 8b89aa7c7b4c583063438a5e976eb601f1500d5e0f71179bba44bb5651293f51
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to direct users to potentially malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically classified as a phishing trojan. The embedded URLs, such as 'https://lozipotod.ru/award?keyword=the+chemistry+of+nanostructured+materials+pdf', are likely used to distribute further payloads or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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://lozipotod.ru/award?keyword=the+chemistry+of+nanostructured+materials+pdf PDF link annotation
    • https://cdn.sqhk.co/tefaxobaf/heq9DLu/csep_guidelines_for_youth.pdfIn PDF document text
    • https://cdn.sqhk.co/zapevexuvot/gfidjav/application_giant_ride_control_app_deutsch.pdfIn PDF document text
    • https://cdn.sqhk.co/badaxiloru/gFhgAie/3841671712.pdfIn PDF document text
    • https://cdn.sqhk.co/borefigux/jeasuLG/73566115132.pdfIn PDF document text
    • https://cdn.sqhk.co/vuxesojogugu/hajfghj/36854223208.pdfIn PDF document text
    • http://xigesoti.iblogger.org/how_many_calories_are_in_a_jersey_mikes_club_sub.pdfIn PDF document text
    • http://xurufotuzu.iblogger.org/fasilulasubibotetu.pdfIn PDF document text
    • https://cdn.sqhk.co/rojarimeg/hd6iigc/kinesamerukimedesisafe.pdfIn PDF document text
    • https://cdn.sqhk.co/surodamiz/ibDWE6w/space_drawing_perspective_dongho.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/sikuva/golofinovu.pdfIn PDF document text
    • https://s3.amazonaws.com/vekodupiwarobi/bose_acoustimass_15_series_ii_service_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/gagagakigibapo/multi_storey_building_design_using_staad_pro.pdfIn PDF document text
    • http://gupupofof.rf.gd/mini_crock_pot_instruction_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/megodipewukitoj/bangla_album_hd_video_song_free.pdfIn PDF document text
    • https://3ecb585b-79b8-4502-8567-d9a17299c5c1.filesusr.com/ugd/4b874d_df67088134d949b5a3fb8854d108311e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kabisebax/73323004626.pdfIn PDF document text
    • https://ac685e6e-6442-44c0-91a1-b3a367e79ef2.filesusr.com/ugd/ce77c6_07fccd0205164c1781ef9c060f9cc28f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lukepepe/i_have_already_informed_meaning_in_urdu.pdfIn PDF document text
    • http://fujuresaw.epizy.com/55030322429.pdfIn PDF document text
    • https://s3.amazonaws.com/pafiganovavi/latex_template_for_homework_assignment.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_off000116fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116FE 5444 bytes
SHA-256: 2187201a62c0ea4d245bfc0f3699695e35553342d30540d160e3a62ddc799683
font_01_sfnt_off00012962.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12962 11356 bytes
SHA-256: 3e438cbf4717291884f2e24d1a2214350fe336ef2d71a3c070805c50018c4bd9

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