Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae75bd8958a1ff07…

MALICIOUS

PDF

76.1 KB Created: 2021-04-06 12:52:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 0daaa7836d871546298d345153727e4e SHA-1: 0b71f22d09fa3ffe80f3bcc68f715e8e825e6e42 SHA-256: ae75bd8958a1ff07c853e6ed43e36df2c080ce938085028995589aae37187212
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to redirect users to potentially malicious sites. ClamAV and ML classifiers confirm its malicious nature, flagging it as a phishing trojan. While no scripts were extracted, the structure and URL patterns strongly suggest a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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 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://xezojetit.ru/strik?utm_term=survivor+chuck+palahniuk+sparknotes PDF link annotation
    • http://vkrowl.com/free_alternative_to_letasoft_sound_boosterbqxhm.pdfIn PDF document text
    • https://cdn.sqhk.co/jowapezo/nMtObFX/fetovefin.pdfIn PDF document text
    • http://hotloveme.online/74975442000eikhc.pdfIn PDF document text
    • https://cdn.sqhk.co/kewukapugino/a7gi9lG/1472379298.pdfIn PDF document text
    • https://fabebebu.weebly.com/uploads/1/3/2/7/132740756/617951.pdfIn PDF document text
    • https://cdn.sqhk.co/gobajejuz/hgi8v1V/zunekowakubaxumugukiwid.pdfIn PDF document text
    • http://blaugrana.ru/terogeledudegateduwjlrc.pdfIn PDF document text
    • http://qwertyujg.xyz/meaning_of_neighbourhood_in_marathijx8hq.pdfIn PDF document text
    • https://likojekiputisi.weebly.com/uploads/1/3/4/5/134576895/vodubewo-rerizuloxefowef.pdfIn PDF document text
    • http://awpmode.com/what_is_another_name_for_outstanding_expenses_answerb6xpa.pdfIn PDF document text
    • https://dazuzoboda.weebly.com/uploads/1/3/4/0/134017564/1454883.pdfIn PDF document text
    • http://kind-insta.site/zimilovujoxezanakotebadipyxi0.pdfIn PDF document text
    • https://cdn.sqhk.co/jebozibiru/1rZhfHN/fruits_fancy_dress_costume_ideas.pdfIn PDF document text
    • https://pagowabelada.weebly.com/uploads/1/3/0/8/130874520/7024808.pdfIn PDF document text
    • http://ig-copyrightnoticehelp.com/6506234541izw4l.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://b3709dad-42f4-4621-9b7e-74d31ca978cd.filesusr.com/ugd/f91cf1_71cd7cdd563240d3a25705faf39d09e3.pdf?index=trueIn PDF document text
    • https://ebbb41b5-b8b7-4bfc-9e1b-23e79ad93844.filesusr.com/ugd/5eba67_4f5b4dec6033434dbb4e363110f9ab62.pdf?index=trueIn PDF document text
    • https://883cd1dc-02d0-4059-8fa2-99201f92b631.filesusr.com/ugd/6166c9_2807b556d3e74eb0aab196f38541093f.pdf?index=trueIn PDF document text
    • https://f8e303d0-f350-43d2-b7c3-f886ef13ec25.filesusr.com/ugd/1bb397_0f37ec69020f46eda0efce8289acd849.pdf?index=trueIn PDF document text
    • https://5cbbff6b-7c47-4fbb-abda-9de5069fbc88.filesusr.com/ugd/1a89c8_f6429758a7b84460b023479513ee7f95.pdf?index=trueIn PDF document text
    • https://d78d2789-9aef-4bfd-88be-9093bec910ef.filesusr.com/ugd/87a178_a56a948933d941e3b5db61c950c41aca.pdf?index=trueIn PDF document text
    • https://4be8a7ba-6c9a-47a4-99fc-a5961b41a404.filesusr.com/ugd/132250_ab152adf2dd74c0b93ab45776da8f589.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_off0000edf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF2 5248 bytes
SHA-256: 1a74727f10e5951c53d765e4b282321be817d182d0617bc1aa889ca076be279e
font_01_sfnt_off0000ffcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFCD 10412 bytes
SHA-256: 45feb7caa6a34ff51b1c1839058d1130cac08d2aa84e981b0b0b613d48f13730