Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c1e84bdbbba3c8d…

MALICIOUS

PDF

66.9 KB Created: 2021-04-29 07:49:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 433bfbaff86265aba2df7980c9d74c2e SHA-1: 731e4de42a1c57908295418af7ab09d4f48ca053 SHA-256: 1c1e84bdbbba3c8d9526904565f44ba19f7f7dd5314a421818c97ad63dbddca2
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://gimoguvi.ru/strik?utm_term=navy+nike+tech+fleece+junior PDF link annotation
    • https://wazawuxara.weebly.com/uploads/1/3/4/7/134762715/9771384.pdfIn PDF document text
    • https://dituxawijobuf.weebly.com/uploads/1/3/0/9/130969532/tevokipo.pdfIn PDF document text
    • https://sazefowefojewen.weebly.com/uploads/1/3/4/8/134893887/zizomemafovida.pdfIn PDF document text
    • https://cdn.sqhk.co/nezupusovefi/chgCgfL/vobokigomuk.pdfIn PDF document text
    • https://zegaturivelegob.weebly.com/uploads/1/3/1/4/131437779/9c3b3.pdfIn PDF document text
    • http://kawibijew.22web.org/blessed_be_god_prayer_book.pdfIn PDF document text
    • https://povobaza.weebly.com/uploads/1/3/4/3/134383372/3c4d49e7eaa.pdfIn PDF document text
    • https://cdn.sqhk.co/tatidukigag/dicyGij/dalerojopulilimitulake.pdfIn PDF document text
    • https://nudikiwo.weebly.com/uploads/1/3/4/0/134042489/6022747.pdfIn PDF document text
    • https://cdn.sqhk.co/vipujitebiki/dQfFPhj/vufosodijinagotonukuzu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ded05c8b-f0d8-42bc-a64b-daa0b63394ca.filesusr.com/ugd/99afdc_96c2700e540d420db628aff8bc5fe3df.pdf?index=trueIn PDF document text
    • http://luxopemuvoxu.rf.gd/bissell_little_green_proheat_carpet_cleaning_machine_2513g_review.pdfIn PDF document text
    • https://s3.amazonaws.com/setigafat/28756219747.pdfIn PDF document text
    • https://s3.amazonaws.com/dalava/tirigomikutekodewu.pdfIn PDF document text
    • https://c22e5cf4-338a-4003-9cad-c1cb0be29285.filesusr.com/ugd/3db607_a0a39c92eb124aa7afa0c399c9433502.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bejikefowu/what_is_1018_cold_rolled_steel.pdfIn PDF document text
    • http://junikelop.rf.gd/genogram_templates_free.pdfIn PDF document text
    • https://7e079b21-6cfc-4bbc-a8af-001f4930a7f2.filesusr.com/ugd/f66805_cb9a4347e6dd4dae8184ea3f28fd8913.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_off0000c957.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC957 5064 bytes
SHA-256: 8230086ba42b13a6ff145a007485b24d946a0ac98703229d351ab1c8041045da
font_01_sfnt_off0000daa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAA7 10656 bytes
SHA-256: 94bc792149211acb0e1b3028ebbc573cdc127f1db0f27d1bd4cc85807cb1c194

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