Malicious PDF — malware analysis report

Static analysis result for SHA-256 a826893defe5b75f…

MALICIOUS

PDF

91.6 KB Created: 2021-03-20 09:44:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 78382a9ff1e095bc487304b183ee0e3a SHA-1: 88cdd84a3f5814e8bb2717b6fdd853e9821b3d32 SHA-256: a826893defe5b75fde8c203116cc1c08294f0d4f2c6505383d733648d5061f76
196 Risk Score

Malware Insights

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

This PDF file exhibits characteristics of a phishing lure, employing a large number of external links, many of which point to benign PDFs, but at least one redirects to a suspicious URL. The ML classifier and ClamAV detection strongly indicate malicious intent. The primary suspicious URL, https://jumiwimov.ru/123?utm_term=chromium+revision+is+not+ed, is likely used to redirect users to a malicious payload or phishing page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://jumiwimov.ru/123?utm_term=chromium+revision+is+not+ed PDF link annotation
    • https://cdn.sqhk.co/jeforije/gfcfFcQ/equalizer_pro_apk_android.pdfIn PDF document text
    • http://texifudosino.mygamesonline.org/sanotojeseje.pdfIn PDF document text
    • https://cdn.sqhk.co/nomazotesi/hctcfhd/kung_fu_panda_legendary_warriors_wiki.pdfIn PDF document text
    • https://wumibatolazonik.weebly.com/uploads/1/3/1/4/131437616/vamofegezisiwuke.pdfIn PDF document text
    • http://zaxevef.getenjoyment.net/what_is_the_salary_of_a_certified_medical_assistant.pdfIn PDF document text
    • https://fizabogozof.weebly.com/uploads/1/3/2/8/132815807/5e45c08c.pdfIn PDF document text
    • https://cdn.sqhk.co/figegixo/f24ifhd/70257884306.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/dinilederu/batman_killing_joke_comic.pdfIn PDF document text
    • https://ae0ecf71-49bb-4ac4-bba4-d0f2a20d1af9.filesusr.com/ugd/668a47_4d97c65d652c4f52821ec5669cfc0cd9.pdf?index=trueIn PDF document text
    • https://1cd0d4d5-11d4-440c-a307-81f73801f601.filesusr.com/ugd/f0e51d_99c63cece4f34297bc8a98d53c13b9cc.pdf?index=trueIn PDF document text
    • https://329f26c8-0235-4118-8622-173d264d9cf1.filesusr.com/ugd/221f3a_4aa66a9b4cf54903af08d16d03e34ca9.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tojabixefova/95300354561.pdfIn PDF document text
    • https://5b0ea1c3-b874-41d5-a3cc-49595beb80a6.filesusr.com/ugd/0c63be_80fdc510f72440679055125ef7c0823f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xulepiwa/fovudowejepodob.pdfIn PDF document text
    • https://s3.amazonaws.com/rimepusox/contrato_de_auditoria_informatica_ejemplo.pdfIn PDF document text
    • https://s3.amazonaws.com/kizugokofo/29347950493.pdfIn PDF document text
    • https://s3.amazonaws.com/tobobowu/45955467854.pdfIn PDF document text
    • https://s3.amazonaws.com/regovadeje/23363710639.pdfIn PDF document text
    • https://s3.amazonaws.com/xirixepo/femicide_report_2019.pdfIn PDF document text
    • http://xowobovu.myartsonline.com/campark_t40_trail_game_camera_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/kalanejaxutilif/54584624275.pdfIn PDF document text
    • http://levapoloj.onlinewebshop.net/chapter_two_neil_simon.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011cd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CD0 4788 bytes
SHA-256: e051a9788f26ba007a991ac80f2812d08073bbea70ccffd68c3ada0aafa37f20
font_01_sfnt_off00012ce4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CE4 2512 bytes
SHA-256: 085f322c79513b4895e6b5ea00a972e94223ad8acbe441c73456139a31bca323
font_02_sfnt_off000137cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137CF 12184 bytes
SHA-256: 4d0ee395da2cc22c6660b8486a158f9a9a1d73393c3ef8077801fe7f584684e6

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