Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7aa37bc61ef6959…

MALICIOUS

PDF

93.7 KB Created: 2021-03-19 09:10:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 276ee64ca193694d7cb806ecb5efec4e SHA-1: aa08403b4d48b30e97244d8c52b9150ec620b3b5 SHA-256: a7aa37bc61ef6959e9fdff9dc50068fb5565abd8393a2705f47ec305a6e89495
244 Risk Score

Malware Insights

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

This PDF document is identified as malicious due to its extensive use of external links, many of which point to potentially malicious redirectors or link farms. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SEO_LINK_FARM' strongly indicate a phishing or malware distribution attempt. While no scripts were extracted, the sheer volume of suspicious URLs suggests the primary function is to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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 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.
  • 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.
  • 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://dafemum.ru/award?keyword=clinical+infectious+diseases+book+pdf In PDF document text
    • http://drovazvenigorod.ru/23093781358lavwq.pdfIn PDF document text
    • http://sagedix.medianewsonline.com/whitewash_look_on_brick.pdfIn PDF document text
    • https://cdn.sqhk.co/xonepogafix/JjinQjd/xexud.pdfIn PDF document text
    • http://kersita.fun/67016043450p0kg3.pdfIn PDF document text
    • http://nifimoperokoj.medianewsonline.com/turaruvelosu.pdfIn PDF document text
    • http://forexgeeks.net/8-1_skills_practice_geometric_mean_answers_with_workpcvmw.pdfIn PDF document text
    • http://livemavuxedu.getenjoyment.net/kpmg_aptitude_test_questions_free.pdfIn PDF document text
    • http://portkamesto.site/34175303815kvrp.pdfIn PDF document text
    • https://cdn.sqhk.co/tinawegu/iejypPc/futojul.pdfIn PDF document text
    • http://pemotutafid.mywebcommunity.org/what_questions_are_asked_in_a_dementia_test.pdfIn PDF document text
    • http://bunakevogipo.iblogger.org/peter_answers_story.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://61249681-e2d1-4375-841a-b3723294d79c.filesusr.com/ugd/3d514e_66d3551b38c34bfd9dda8363562fa39a.pdf?index=trueIn PDF document text
    • https://bc732cde-fb09-4fee-8ab5-c82a45a1131b.filesusr.com/ugd/2ac701_a218d2eb36e94c388dbfaa6955ab4a69.pdf?index=trueIn PDF document text
    • https://95a57b4d-a24c-4412-bd87-88f4f885d252.filesusr.com/ugd/011e4b_41bab11935694355aaca75d7ba5c6e7c.pdf?index=trueIn PDF document text
    • http://papitanado.rf.gd/ielts_synonyms_for_words_commonly_used.pdfIn PDF document text
    • https://0503187d-52cd-4237-9521-a3cb9bf551ae.filesusr.com/ugd/5bb01c_4daf82f619044531a933627b56a73c01.pdf?index=trueIn PDF document text
    • https://58fabbca-0322-4868-a582-948aa19840f9.filesusr.com/ugd/93748c_5c73921460c14fef8237405b34d474b4.pdf?index=trueIn PDF document text
    • https://c2c662fa-00ac-4c69-bf5d-04da7d6c99e2.filesusr.com/ugd/9b33c5_e6255a274388455780c05311bb2b03c0.pdf?index=trueIn PDF document text
    • http://mafolizol.rf.gd/58349523491.pdfIn PDF document text
    • https://1fae3a98-13b7-4b95-b1f0-1fbd1b7b0aee.filesusr.com/ugd/1da05d_13ddbc6f821746c9afac8db85d60b480.pdf?index=trueIn PDF document text
    • http://vuwotona.epizy.com/artigo_299_do_regulamento_do_imposto_de_renda_decreto_3000_99.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012500.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12500 5164 bytes
SHA-256: 420c8f153efcac4cddf5a1732ef387192bab60511c56e7dd6f05fbffce2ccc0f
font_01_sfnt_off00013694.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13694 10820 bytes
SHA-256: 01ccc8f9dffe5602e795642621d774217ccba75edfba029c9ee275cfb93252e1
font_02_sfnt_off00015b5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B5A 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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