Malicious PDF — malware analysis report

Static analysis result for SHA-256 243aed6258c8871b…

MALICIOUS

PDF

82.1 KB Created: 2021-03-10 04:07:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 55112143f5f90a2554726b54bcaa4946 SHA-1: b00a3e14796dfc94dd4d47a37a942c26426f5607 SHA-256: 243aed6258c8871b48def471bf9d407dd89b522adfcda7b897b705188b4b105d
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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://lozipotod.ru/123?utm_term=orthographic+projection+exercises+mod+answers PDF link annotation
    • http://xufonewujisos.scienceontheweb.net/english_grammar_test_with_answers_free_download.pdfIn PDF document text
    • https://xogukozatakik.weebly.com/uploads/1/3/1/4/131453421/95709faa21addb.pdfIn PDF document text
    • https://zezexofoji.weebly.com/uploads/1/3/4/3/134344156/3863013.pdfIn PDF document text
    • https://cdn.sqhk.co/sabeludejem/rxAMicX/zombie_hq_2_mod_apk_unlimited_money.pdfIn PDF document text
    • http://ladekepevij.mygamesonline.org/mojagogoxiwurewekifakamap.pdfIn PDF document text
    • https://wakevilapiz.weebly.com/uploads/1/3/4/9/134903367/mizebilodu_rimulu_kubajebilozunu_nimut.pdfIn PDF document text
    • https://cdn.sqhk.co/xogovofofi/fTibiaE/69861683355.pdfIn PDF document text
    • http://dostafood.xyz/90327762712cviam.pdfIn PDF document text
    • https://mazokameviseg.weebly.com/uploads/1/3/5/3/135349474/womikexeruvefuseva.pdfIn PDF document text
    • http://1xbet-sportstavki.fun/2541182490lp7kr.pdfIn PDF document text
    • http://momentikshop.space/tiwetopacg321.pdfIn PDF document text
    • https://cdn.sqhk.co/zudilubal/jbheGfe/lta_m_e_checklist.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://85377554-d84f-42a6-a955-c87f7d5d3d8c.filesusr.com/ugd/dd4472_58f3b7167a824f9096386f557591b5bb.pdf?index=trueIn PDF document text
    • https://0543556e-e4c1-4a10-86be-78be3fd76ea2.filesusr.com/ugd/2e16aa_dde622f783f24d7d93914b667de9b255.pdf?index=trueIn PDF document text
    • https://37e0f79d-b0c1-4727-b76d-5b759c81288f.filesusr.com/ugd/9c66ff_8d5f146ddbfd4a27836a3adeedb37e1a.pdf?index=trueIn PDF document text
    • https://c3438639-6a75-4920-aa4f-d1e0b619354f.filesusr.com/ugd/3be3a7_c30391c5b1ed432ea5fff3ed32f3b888.pdf?index=trueIn PDF document text
    • https://a35aa970-3e4e-4c20-be1f-53d10001bce9.filesusr.com/ugd/af4e73_c48d387308354d73aab8d171da18e491.pdf?index=trueIn PDF document text
    • https://a9864912-ad24-422b-99f3-2d90f7703507.filesusr.com/ugd/d6af85_b4e0d3b842eb4abf87cd223995155af5.pdf?index=trueIn PDF document text
    • https://71a0d42b-91d5-4e94-9338-ff69ca8a624b.filesusr.com/ugd/e5d5e5_5028da71eb2345f9ad0c1efded84ac6a.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_off00010137.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10137 5720 bytes
SHA-256: bc55430c8e3f1c7bb1f9f4a8dac0e63305d981c10f3032087fcf268497792e58
font_01_sfnt_off00011499.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11499 11276 bytes
SHA-256: 7eee6952333cce01f1317ef4dd73a1f8a907f2bfb05577cf9abbc411d8433113

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