Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0527ee4c79b9cdb…

MALICIOUS

PDF

82.1 KB Created: 2021-05-12 13:11:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 049cd386d2a27fb5aa42acb570625795 SHA-1: 291f509cd00083530dde434b7e048480800056d4 SHA-256: a0527ee4c79b9cdb047f4861011951e8427731ff3228d9d48d07099f68da3e0a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of external links, many hosted on disposable domains or link farms, indicating a likely SEO manipulation or content distribution scheme. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous unknown reputation URLs supports this assessment. While no scripts were extracted, the structure suggests the document's primary purpose is to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • 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://soxebez.ru/strik?utm_term=the+adventures+of+the+princess+and+mr.+whiffle+part+i PDF link annotation
    • https://cdn.sqhk.co/suzeboxiwo/f1je4rR/dewovifofezuwa.pdfIn PDF document text
    • https://cdn.sqhk.co/nufesewepi/jjihifh/rigesepolaku.pdfIn PDF document text
    • https://nufewaxitobazat.weebly.com/uploads/1/3/4/7/134748461/fa248.pdfIn PDF document text
    • https://sezavifibeka.weebly.com/uploads/1/3/4/4/134463458/bolepatawim.pdfIn PDF document text
    • https://cdn.sqhk.co/fusozuwalas/2gfjic2/file_csv_format.pdfIn PDF document text
    • https://wozukaziximuru.weebly.com/uploads/1/3/4/5/134587045/luponubilufi.pdfIn PDF document text
    • https://cdn.sqhk.co/jabosuve/gimiahg/email_auto_reply_text_examples.pdfIn PDF document text
    • https://petirinupupa.weebly.com/uploads/1/3/1/4/131438611/misixexebafoxi_fixepesexuxun.pdfIn PDF document text
    • https://cdn.sqhk.co/kubepugemaki/iFMuajf/black_ladies_short_haircut_styles.pdfIn PDF document text
    • https://cdn.sqhk.co/posojuvapono/1FMf3ih/splendor_in_the_grass_full_movie_online.pdfIn PDF document text
    • https://cdn.sqhk.co/fenazijeguk/hhhIZhf/60783260416.pdfIn PDF document text
    • https://cdn.sqhk.co/guwiwugomo/f8wjbMT/nowoxagifajudu.pdfIn PDF document text
    • https://rulusekiraz.weebly.com/uploads/1/3/5/3/135322703/9106483.pdfIn PDF document text
    • https://duwutevo.weebly.com/uploads/1/3/4/5/134597351/362148.pdfIn PDF document text
    • https://koponabunabo.weebly.com/uploads/1/3/4/5/134520941/8285680.pdfIn PDF document text
    • https://tozobaveje.weebly.com/uploads/1/3/7/5/137501006/5c8ca2fd42.pdfIn PDF document text
    • https://cdn.sqhk.co/nurijodefa/hejbZIV/battle_blades_games_online.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/feliso/crypto_movie_parents_guide.pdfIn PDF document text
    • https://7fc1e5b2-1dd8-4457-9de2-3dea1ab9f589.filesusr.com/ugd/fedd61_e0819b0f54f44433ace2fb0a36007475.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nonabafat/bemoluko.pdfIn PDF document text
    • https://s3.amazonaws.com/vexeliku/cakewalk_sonar_x3_full.pdfIn PDF document text
    • https://f5f74d4f-f804-4d9b-9bfa-9964b2756261.filesusr.com/ugd/e389b3_bc1b3b1a95424830929bc0e1a07f8683.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f8f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8F5 5528 bytes
SHA-256: b2a8d8372326faddab291f271da235a01c4fd2208e3d7333d17bd519c0c19063
font_01_sfnt_off00010bad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BAD 1748 bytes
SHA-256: 6a1983e63b60cbbbabae9faf7a71afda56a294c53d8feb1afce8878784dccd99
font_02_sfnt_off00011424.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11424 10980 bytes
SHA-256: 624e22573fbd675c1d25f81591d0414eb0dd71363569d90ef7d22f79451d52ec