Malicious PDF — malware analysis report

Static analysis result for SHA-256 617081ad87e3182a…

MALICIOUS

PDF

69.9 KB Created: 2021-02-19 12:59:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 0cc92c1f9e03e38ccf2a0ba493300ed7 SHA-1: 6e77708ba0492134582793bc49587420ba39bca0 SHA-256: 617081ad87e3182ab49dcbbd1584623ecc4f13fa783ec4ef5ee8c672734a81a0
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various PDF files hosted on multiple domains. This suggests a link-farming or content distribution scheme. The ClamAV detection and ML classifier further support its malicious nature, likely as a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://jacksth.ru/aws?utm_term=excelsior+definition+new+york PDF link annotation
    • https://cdn.sqhk.co/fakomuse/cjiFgWi/xigonodefobolesuvejavezim.pdfIn PDF document text
    • https://cdn.sqhk.co/tamoravuwera/5ggicnk/crowd_followers_hungry_flip_master_mod_apk.pdfIn PDF document text
    • https://lomofoxagut.weebly.com/uploads/1/3/4/5/134524577/fofiwerokugu.pdfIn PDF document text
    • https://cdn.sqhk.co/wiluxuko/LVnLagf/bass_pro_shops_springfield_mo_shooting_range.pdfIn PDF document text
    • https://rirudelibuwa.weebly.com/uploads/1/3/1/6/131606594/081b5706325ec2.pdfIn PDF document text
    • https://cdn.sqhk.co/pobumepova/ic4ggPr/woselopepowezavetenetodep.pdfIn PDF document text
    • https://cdn.sqhk.co/delopomixaba/ihbijXm/kejikakox.pdfIn PDF document text
    • https://suzazega.weebly.com/uploads/1/3/4/4/134476369/pitajerekigerik.pdfIn PDF document text
    • https://vezaruve.weebly.com/uploads/1/3/1/3/131378950/fefaxekajufifubukugo.pdfIn PDF document text
    • https://xapitutas.weebly.com/uploads/1/3/0/8/130813648/bitis-vobofosusav-tetatofevoza-zomugilalato.pdfIn PDF document text
    • https://cdn.sqhk.co/pobumepova/sciillI/mupen64plus_n64_emulator_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/pipujevi/hdchghh/cartoon_network_arcade.pdfIn PDF document text
    • https://cdn.sqhk.co/lukejisuvawe/jejjchh/wokapito.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/gulapore/puvinopowovener.pdfIn PDF document text
    • https://s3.amazonaws.com/fosagobomap/amazon_app_for_android_2._3._6.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_off0000d309.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD309 5088 bytes
SHA-256: ac5e8e255497ca5503839eae246370854b88cfacfba674be4f1b5bd1f11ae10b
font_01_sfnt_off0000e48d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE48D 11224 bytes
SHA-256: b020f8fb085c93f0530d2e2fbc3cb3a9f5d6f35074b6b7bc66c8fef19dab7b79

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