Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc8e2b5d7e158f8f…

MALICIOUS

PDF

111.7 KB Created: 2021-02-16 21:39:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: a7cc5b892c93c2556a07e732b3751e7e SHA-1: 6bc4a2e5d264581e23a1f19a5d3e6ae12adf79d2 SHA-256: fc8e2b5d7e158f8fdb1e85017019c52cfc7922fccef1ea894c0ad9d43f852b4f
156 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, pointing to various PDF files hosted on external domains. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically phishing. While no scripts were explicitly extracted, the structure and numerous external links suggest an attempt to redirect users to malicious content, likely for malware distribution or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • 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://bologen.ru/wix?keyword=scope+manual+sheep PDF link annotation
    • https://cdn.sqhk.co/sebidurubuze/hcjciad/xatimawe.pdfIn PDF document text
    • https://tefafovok.weebly.com/uploads/1/3/4/5/134588422/4372887.pdfIn PDF document text
    • https://cdn.sqhk.co/limiwebu/e9eR0jg/calla_lily_plant_care_uk.pdfIn PDF document text
    • https://cdn.sqhk.co/gebemiwisero/7ghzgc5/weekend_vacation_deals_near_me.pdfIn PDF document text
    • https://cdn.sqhk.co/vakenuda/chijchc/dotuxekidatejureban.pdfIn PDF document text
    • https://cdn.sqhk.co/pitekofotada/h39gdZ7/skin_editor_for_minecraft.pdfIn PDF document text
    • https://cdn.sqhk.co/borefigux/jfrxZ53/photo_vault_app_iphone_deleted.pdfIn PDF document text
    • https://tawedituja.weebly.com/uploads/1/3/4/8/134864040/967973.pdfIn PDF document text
    • https://cdn.sqhk.co/bidelefo/bgeQaja/40070552530.pdfIn PDF document text
    • https://cdn.sqhk.co/miburixegapu/4sijGyQ/wakiwej.pdfIn PDF document text
    • https://cdn.sqhk.co/wejawujagi/PjgPhhf/lucky_knife_game_download.pdfIn PDF document text
    • https://cdn.sqhk.co/pijujuweg/5hd4DDM/furniture_online_shopping_app_buy_cheap_tickets.pdfIn PDF document text
    • https://ponirusorigimo.weebly.com/uploads/1/3/0/7/130738629/lunuk_toferenev.pdfIn PDF document text
    • https://cdn.sqhk.co/vaxizavex/Hgho1iF/fawejetawufim.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://repeputowuz.epizy.com/android_busybox_install_failed.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00016ee0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16EE0 4936 bytes
SHA-256: fdf9d3d54620f524646da95202fda537267751334823969e7f72632a678d1cc5
font_01_sfnt_off00017f61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17F61 10640 bytes
SHA-256: be00709811453417eafc4ec87373c7ee64f1201d658a7379bd079efdb98b18f0
font_02_sfnt_off0001a38d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A38D 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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