Malicious PDF — malware analysis report

Static analysis result for SHA-256 240f685f71e8107b…

MALICIOUS

PDF

87.8 KB Created: 2021-03-15 15:43:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 400034ffeeed14df0f69636cea43f140 SHA-1: 7833427d5d780851c82259f3fc9d888de18abff6 SHA-256: 240f685f71e8107b327b7bc94efde0f7e1412b02255e7b888a3c51b693b28b1f
196 Risk Score

Malware Insights

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

The PDF contains a large number of external links to other PDF files hosted on various domains, indicating a link farm or a distribution mechanism for malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure of the PDF itself is indicative of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 6

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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=analise+combinatoria+mundoedu+pdf
    • http://lalabomujulimof.mywebcommunity.org/new_additional_mathematics.pdf
    • http://nemosixumeki.mypressonline.com/what_are_the_basics_of_algebra_2.pdf
    • https://jefiwoso.weebly.com/uploads/1/3/5/9/135996081/404e2a131e627.pdf
    • https://bakubirusi.weebly.com/uploads/1/3/4/6/134680497/5551472.pdf
    • https://tujiniwiko.weebly.com/uploads/1/3/5/3/135350236/lawef-wewaxenivulo.pdf
    • https://mesopivupezuna.weebly.com/uploads/1/3/5/3/135311967/9a46a2807f1299.pdf
    • https://subilitukufune.weebly.com/uploads/1/3/4/6/134629352/gumupavepob-zedezeboruwu.pdf
    • https://fenuwobubejugud.weebly.com/uploads/1/3/1/4/131454420/vonakumuwuz.pdf
    • http://ita-bio.space/zofelubisuwalidemqxt77.pdf
    • https://luribexibaw.weebly.com/uploads/1/3/4/7/134750384/zokera-jadis-namonodunabojoj.pdf
    • https://xaleratugigajij.weebly.com/uploads/1/3/4/6/134631249/suvimutukado_teper_gonam.pdf
    • https://fomezesas.weebly.com/uploads/1/3/4/3/134343882/naladevalozalod_migupug.pdf
    • https://cdn.sqhk.co/mugejufunij/ijysZig/learn_spanish_listening_and_speaking_english.pdf
    • https://cdn.sqhk.co/bolukafox/euijfhg/escape_room_mystery_word_level_111_answer.pdf
    • http://circulyarkadigital.xyz/xusifokozikegezibudabosidhgyqb.pdf
    • https://cdn.sqhk.co/rolidofajug/iggric1/impossible_track_sky_bike_stunts_3d.pdf
    • https://cdn.sqhk.co/posebozej/TAii6CD/tifufubebizovobexelunaxak.pdf
    • https://bewepuxajijasi.weebly.com/uploads/1/3/4/3/134362307/6493161.pdf
    • https://cdn.sqhk.co/juselivo/ngfijkU/.pdf
    • http://italy-small.space/71374363514110ha.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/remuv/play_android_apps_on_pc_windows_7.pdf
    • https://s3.amazonaws.com/tuzakifezara/computer_elevation_cad_block_free.pdf
    • https://s3.amazonaws.com/sesijesule/rovak.pdf
    • https://s3.amazonaws.com/pesetufavo/financial_statement_analysis_project_report.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fc4a.bin
f45da5673df042679e2ccf4f656f4ba2dfdf935e22133408f0ecb92460a031c5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC4A 5432 bytes
font_01_sfnt_off00010ea0.bin
b426fb3a3a4d5a8ac61d24ddb4a59b68f8cb0ecb21c8b493f35d5b0fdfba5aee		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10EA0 14044 bytes
font_02_sfnt_off00013a11.bin
cac455e2405841eafc36aab02eb9cf7a84e700146dc283a7b224059cbaed9ddf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13A11 16396 bytes

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