Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d6c85cda1313b7c…

MALICIOUS

PDF

73.9 KB Created: 2021-04-05 03:12:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c994a0c236dcbb370fff67c161ed44bd SHA-1: b523c3936356a1b591479e9a722d7e9c25f70bc0 SHA-256: 0d6c85cda1313b7caa295e1a1f3f584d0c8648fc0f1d677fb46ec8c24d4f2764
196 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to other PDFs, indicating a link farm designed to distribute malicious content. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic suggests the document may be part of a multi-stage attack, potentially requiring a password to decrypt a payload. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://druttle.ru/award?keyword=because+of+mr.+terupt+pdf
    • https://sinupumu.weebly.com/uploads/1/3/4/8/134893056/7236b55.pdf
    • http://nurigoluda.mygamesonline.org/physiology_costanzo.pdf
    • http://tojuvapemupo.mywebcommunity.org/aadhar_card_password_recovery.pdf
    • http://zavulibalox.mypressonline.com/57374882770.pdf
    • http://getallcreditscores.info/nagoruredobalamubebujaveg7k49.pdf
    • https://takadoturig.weebly.com/uploads/1/3/4/1/134108809/dimafakuterek-nepodawosupux.pdf
    • http://jamotovoxut.mywebcommunity.org/what_is_order_in_sequence_in_oracle.pdf
    • http://luwinilulurop.mywebcommunity.org/61125394067.pdf
    • http://venolilixe.mygamesonline.org/puzafabapirebemu.pdf
    • http://polnews.xyz/wazipukoferewabudafotitit2dfcd.pdf
    • https://zutiwijutorezaz.weebly.com/uploads/1/3/4/3/134354078/42edb2.pdf
    • http://springital.fun/diwojisuporftle.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/semuxemakaw/tokorofumoburibozifo.pdf
    • https://s3.amazonaws.com/jubiferekaka/how_to_use_a_battery_tender_charger.pdf
    • https://60883313-e483-4213-bdf2-3844198a3b35.filesusr.com/ugd/3ba96b_6cf746c7731a4e7694df124d36fb4ded.pdf?index=true
    • https://s3.amazonaws.com/fidobakipivogit/vanodolomotukakovof.pdf
    • http://vigexosav.myartsonline.com/49438730500.pdf
    • http://jaweratiz.atwebpages.com/assure_model_advantages_and_disadvantages.pdf
    • https://s3.amazonaws.com/jajuzasalikirut/generate_word_document_from_template_java.pdf
    • https://s3.amazonaws.com/mefonevimimix/mojozetepuvex.pdf
    • https://190d602c-e74a-4ea1-b1d2-d722d7947d0f.filesusr.com/ugd/1eddd4_a31d20b4f53a46d8a1dff74971df6fc4.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_off0000e475.bin
24c6c66097d6a3e2a93bafe22085a72ecac8ccacf456b75ef14fb89ddfef0374		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE475 5348 bytes
font_01_sfnt_off0000f696.bin
567a799a830fd1c24ad287a0a846f993ead1cd710e72584fb6da8526298b6b30		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF696 10448 bytes

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