Malicious PDF — malware analysis report

Static analysis result for SHA-256 c55426e8199265b9…

MALICIOUS

PDF

76.4 KB Created: 2021-03-31 19:24:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 7c1eb62bd00280aa4fa788cec2d3171f SHA-1: 1164ab71f6eb690e948949d8191e280c9218e920 SHA-256: c55426e8199265b9910165d6242e571c47e858ae297044600a1d028fdaf19054
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://zajinet.ru/wix?keyword=1.3+aplia+assignment+answers PDF link annotation
    • https://cdn.sqhk.co/difixoruze/62ijvb9/dark_raider_android_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/rifarako/gdijfHC/driving_school_sim_ovilex_mod_apk_download.pdfIn PDF document text
    • http://rexirututesopew.iblogger.org/webovotafasakedunos.pdfIn PDF document text
    • http://vukosam.22web.org/6418818139.pdfIn PDF document text
    • http://boxijogirexu.medianewsonline.com/where_to_buy_blood_bowl_miniatures.pdfIn PDF document text
    • https://poximixej.weebly.com/uploads/1/3/0/7/130776069/27d82.pdfIn PDF document text
    • https://bitoxogosem.weebly.com/uploads/1/3/4/3/134386372/07a8c05e61a.pdfIn PDF document text
    • https://tajafakedebufu.weebly.com/uploads/1/3/1/4/131438499/8966816.pdfIn PDF document text
    • https://tezagezowuvese.weebly.com/uploads/1/3/0/7/130775310/delotidizamamit-runup-xunidiri-zipokeseruxur.pdfIn PDF document text
    • https://cdn.sqhk.co/xopuxuvop/qijFDc1/80965091087.pdfIn PDF document text
    • https://cdn.sqhk.co/mojesoje/NHGhf6V/71293577866.pdfIn PDF document text
    • http://texifudosino.mygamesonline.org/john_deere_riding_mower_deck_belt_diagram.pdfIn PDF document text
    • http://zowuzigokov.22web.org/vubupasojaxaridubejexetu.pdfIn PDF document text
    • https://cdn.sqhk.co/suzagofi/ijjhVD1/lost_sphear_metacritic.pdfIn PDF document text
    • http://ritefajitexu.scienceontheweb.net/cbse_board_exam_date_sheet_2020_class_10_download.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/watajive/what_temperature_should_a_whirlpool_refrigerator_be.pdfIn PDF document text
    • https://s3.amazonaws.com/lorugipopuxe/97644446378.pdfIn PDF document text
    • https://667b589a-70dd-4c78-a03f-47f6e9f07b1f.filesusr.com/ugd/db80c5_d0156d6ce47141a2bcfc2a70f276e0bc.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/polexebuj/best_acoustic_guitar_songbooks.pdfIn PDF document text
    • https://be08d7d4-326a-4801-be9d-4496af17a43b.filesusr.com/ugd/d31907_129d501cbc9843a98861e0990ff8659c.pdf?index=trueIn PDF document text
    • http://waxukoke.epizy.com/asus_p5n32-e_sli_specs.pdfIn PDF document text
    • http://letotake.epizy.com/jarexutop.pdfIn PDF document text
    • https://s3.amazonaws.com/kumasala/baldurs_gate_2_dark_alliance_ps4.pdfIn PDF document text
    • https://86042ffc-9b62-460b-8552-fb2522205a17.filesusr.com/ugd/4f92c1_4c1f0dabbb834fffa3e2ba6231a01d96.pdf?index=trueIn 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_off0000eb76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB76 5384 bytes
SHA-256: 70b2f0f73de54d900c6c96428a825bba75f68cb003f21c0576281a569c507cd6
font_01_sfnt_off0000fdd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDD2 11232 bytes
SHA-256: a308824fe736040ab1cee4cc1ec15c47074069d78bc21ecfab9b6f53240cf13b