Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5111746ab116f10…

MALICIOUS

PDF

73.8 KB Created: 2021-02-12 01:48:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 33f44309d8000dc4e2c9bf2d5e672495 SHA-1: d6ec232d15e492bd8e188397b1d088e926cac5d9 SHA-256: c5111746ab116f106568e3c722a96d9d8437e4d22a1b645ae605443d93d82b8c
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 0.9999

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://druttle.ru/wix?keyword=cute+unique+baby+boy+names+yahoo+answers PDF link annotation
    • https://cdn.sqhk.co/fenazijeguk/cAjc9Vk/77440531428.pdfIn PDF document text
    • https://cdn.sqhk.co/xakurusuk/jcgeB1N/guess_the_word_pictures_and_answers.pdfIn PDF document text
    • https://mibivatoroxup.weebly.com/uploads/1/3/4/7/134762409/b8f298e.pdfIn PDF document text
    • https://cdn.sqhk.co/tijinujul/geIUhjY/juxokot.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373527/normal_5fec69c4b14d8.pdfIn PDF document text
    • http://vivoxasoro.22web.org/abs_academic_journal_guide_2017.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450632/normal_601bdfdb96774.pdfIn PDF document text
    • https://cdn.sqhk.co/jigugabopu/en1a2Dv/kusinapevutazojuxefoniti.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wixamupelinere/84117297490.pdfIn PDF document text
    • https://s3.amazonaws.com/xubifupi/autotransformer_starter_timer.pdfIn PDF document text
    • https://s3.amazonaws.com/rijaliwiguvex/31837422364.pdfIn PDF document text
    • https://s3.amazonaws.com/pizivurapab/volebodevugixizip.pdfIn PDF document text
    • http://zoxutuperovizo.epizy.com/wuxagimiredutin.pdfIn PDF document text
    • http://lopogoroje.rf.gd/braso_da_repblica.pdfIn PDF document text
    • http://tufukupetateto.epizy.com/mapad.pdfIn PDF document text
    • http://molitumulejoji.rf.gd/automatically_email_google_spreadsheet.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d84a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD84A 5260 bytes
SHA-256: 584c1171cadf68d110a89b3667391c2292f57acad4b4559e1605d52ba91e092d
font_01_sfnt_off0000ea10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA10 15788 bytes
SHA-256: 48502ae4008b98696ccb9ec26f01de0a720ee29b83adc22ad671445729735b1f