Malicious PDF — malware analysis report

Static analysis result for SHA-256 1416df8a5d9ce586…

MALICIOUS

PDF

81.7 KB Created: 2021-04-04 02:58:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 5f76bd02afcfd7ecad6417c72a430dac SHA-1: d16512634479a5da3bb5e86f882f022d99ba3b21 SHA-256: 1416df8a5d9ce5860fc944464d2e8c4eded41de6fad9260cefa7e66997d0faf0
144 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link pointing to 'https://crophysi.ru/award?keyword=cassandra+clare+livros+pdf'. This link is flagged as malicious and is the primary indicator of compromise. The document body is heavily obfuscated and does not provide clear textual lures, but the presence of a malicious link strongly suggests a phishing or malware distribution attempt. No scripts were extracted, but the PDF structure itself facilitated the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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.
  • 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://crophysi.ru/award?keyword=cassandra+clare+livros+pdf In PDF document text
    • http://dadamipu.iblogger.org/tudevokepulagaxiji.pdfIn PDF document text
    • https://cdn.sqhk.co/madufuxenuw/gf2Xicx/mowalibumisafelete.pdfIn PDF document text
    • https://cdn.sqhk.co/padixemugex/wBghYjg/maplestory_retro_world_shop.pdfIn PDF document text
    • https://cdn.sqhk.co/lexoxuxoluvi/eWhbggE/xatejemunoxezanuwetutixov.pdfIn PDF document text
    • https://cdn.sqhk.co/karadirimose/gigioja/rigipopateleg.pdfIn PDF document text
    • https://cdn.sqhk.co/gemadaruvow/hcqhghj/kobe_bryant_hd_wallpaper_for_android.pdfIn PDF document text
    • http://xemokajoled.medianewsonline.com/nozokuvibawazoj.pdfIn PDF document text
    • https://cdn.sqhk.co/dofexoxev/FIhhhjg/used_cars_near_me_under_2000_craigslist.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/jezaxojipevu/61741100520.pdfIn PDF document text
    • http://vepipivozox.rf.gd/marriage_certificate_form_gujarat_in_gujarati.pdfIn PDF document text
    • https://s3.amazonaws.com/mamukawaxatali/elisa_lam_autopsy_report.pdfIn PDF document text
    • http://kaseborodemo.rf.gd/video_show_vip_mod_apk.pdfIn PDF document text
    • http://julexobe.rf.gd/xewazeguz.pdfIn PDF document text
    • https://s3.amazonaws.com/wegugus/folic_acid_foods.pdfIn PDF document text
    • http://vofovesotidogi.epizy.com/quiz_games_questions_and_answers.pdfIn PDF document text
    • http://sajoveguduv.onlinewebshop.net/48101006174.pdfIn PDF document text
    • http://tawatibajat.rf.gd/botiwez.pdfIn PDF document text
    • http://dowupozor.epizy.com/18533784633.pdfIn PDF document text
    • https://s3.amazonaws.com/paxuvagal/36845715632.pdfIn PDF document text
    • http://kubudafexajik.rf.gd/vidmate_all_music.pdfIn PDF document text
    • https://s3.amazonaws.com/limepusotanal/kaxonozix.pdfIn PDF document text
    • http://jipudovisubu.rf.gd/50739619528.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_off0000fb63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB63 5116 bytes
SHA-256: aecad3aa02cbad3ef4849ed08983380728de4bd50c162722171ba5f403fd6ddd
font_01_sfnt_off00010cdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CDF 14152 bytes
SHA-256: ba8e671373a0fc8d72f90036c045323787e7b7eb95cb5a69fbcef2a5d4dbf100

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