Malicious PDF — malware analysis report

Static analysis result for SHA-256 10367a6f6bae3839…

MALICIOUS

PDF

94.2 KB Created: 2021-03-06 16:00:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3135b860ee81d255580a30888dc155bc SHA-1: 88d01b1ddc384178eee4962e70541442d609c464 SHA-256: 10367a6f6bae38390de0d52ecdb9be46c2d02ef808f4ceae981eec3db896543a
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, suggesting a malicious intent to manipulate search engine results or redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate this PDF is malicious, likely a phishing or SEO spam campaign. No scripts were extracted, but the presence of numerous external URLs points to a redirection or download mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://golowaki.ru/123?utm_term=westminster+chime+antique+mantel+clocks
    • https://cdn.sqhk.co/feguzuvubut/hz3gj44/26638338844.pdf
    • https://cdn.sqhk.co/subilikiwi/idibgdr/terisazerarada.pdf
    • https://cdn.sqhk.co/segenapiza/sdgghiF/apphi_schedule_posts_for_instagram.pdf
    • https://cdn.sqhk.co/zolulesar/5hihbjh/12601883933.pdf
    • http://beremoter.online/wimukamalitosokuloj88dql.pdf
    • https://cdn.sqhk.co/xemugugafot/rDgeijf/free_hearts_app_for_ipad_word_processing.pdf
    • https://cdn.sqhk.co/felolavap/hdijA5w/modern_warfare_server_lag_2020.pdf
    • http://smartcreditus.info/dikejozuduxavipaja528y.pdf
    • http://wusujobarowi.22web.org/rovuzagujadagedif.pdf
    • http://realnoe-obshenie.online/how_does_the_legal_system_work_in_the_uke76qd.pdf
    • http://rte-ita.fun/gubekiwivubexa5at5f.pdf
    • https://cdn.sqhk.co/pemenodisoda/fghyick/best_artificial_intelligence_stocks_to_buy_2019.pdf
    • http://datumileriz.22web.org/big_nate_book_level.pdf
    • http://xuzanuwije.22web.org/xawelenuwovafivavip.pdf
    • http://doluridibulif.iblogger.org/cbse._net._nic._in_application_form.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://2ea9429b-0332-4ee6-bb75-ab9535b56c99.filesusr.com/ugd/e2f7e1_7a6fb1926b294acc8d7ba47b47d0bc9e.pdf?index=true
    • https://8a5a474a-a671-4857-921d-d1df0ee72544.filesusr.com/ugd/523716_23ecf820176a40e9846cbee140dbfee7.pdf?index=true
    • https://3437305d-a3f4-4f94-9a63-846dd410f5be.filesusr.com/ugd/ffe76b_31feaf0f6c5b4c5fb011e5d45f6d7a2a.pdf?index=true
    • https://14535e1a-360a-4d01-a655-fa33e115c80e.filesusr.com/ugd/b222ea_efe9fc94ec114b35abf46db58ddc5b48.pdf?index=true
    • https://329f26c8-0235-4118-8622-173d264d9cf1.filesusr.com/ugd/221f3a_89e78adaf3a6419391cbfccee28de5e9.pdf?index=true
    • 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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000134f4.bin
697d77b7258dc3d2ee9bcc3019ebf20ef31ebb120e7c8451d642af00af2b1841		 pdf-font-stream PDF embedded font (sfnt) at offset 0x134F4 5240 bytes
font_01_sfnt_off000146ad.bin
85f71ea93231d5c98c6a5ec18e68aea260050f2e380dc9132a70cb8f07b67368		 pdf-font-stream PDF embedded font (sfnt) at offset 0x146AD 10932 bytes

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