Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf7ef637485dc4de…

MALICIOUS

PDF

80.2 KB Created: 2021-02-26 21:48:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: e47325c98cfbddae4a354567c099d27b SHA-1: d65160c91d578d590faec6f0f91607bb88c75b1a SHA-256: cf7ef637485dc4de440ae7a39d4d0da467142e350bec37c2b93775ad896a4215
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, with one heuristic specifically identifying it as a 'PDF_SEO_LINK_FARM'. The primary external URL, https://ponafet.ru/123, suggests a potential phishing or scam lure. While no scripts were explicitly extracted, the PDF structure and the presence of numerous external links indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://ponafet.ru/123?utm_term=how+much+1+dozen+dunkin+donuts+in+uae PDF link annotation
    • https://bujovuve.weebly.com/uploads/1/3/0/7/130738596/vutav.pdfIn PDF document text
    • https://xujokutiw.weebly.com/uploads/1/3/4/7/134749543/duloxok_dituduzo.pdfIn PDF document text
    • https://cdn.sqhk.co/pabefidinaz/aifBtig/download_zombie_busters_squad_mod_apk.pdfIn PDF document text
    • https://xirejefeju.weebly.com/uploads/1/3/4/7/134723985/525d9d3.pdfIn PDF document text
    • https://jokunotewe.weebly.com/uploads/1/3/5/3/135314966/xakefimegaz.pdfIn PDF document text
    • https://jedarixires.weebly.com/uploads/1/3/0/9/130969076/9762257.pdfIn PDF document text
    • http://apelsins.space/wamavutozufv7ja.pdfIn PDF document text
    • http://1green.space/history_channel_roman_empire_series66a1b.pdfIn PDF document text
    • https://kagojidumone.weebly.com/uploads/1/3/2/7/132740327/rekagulugebamuwomiz.pdfIn PDF document text
    • https://cdn.sqhk.co/dodipenameki/whf7iir/39094678246.pdfIn PDF document text
    • https://rurusoweloxefug.weebly.com/uploads/1/3/3/9/133989150/zemufaf_balanagibarutag_jitomatutudusa_nadekabireva.pdfIn PDF document text
    • https://tapizijivuvol.weebly.com/uploads/1/3/2/6/132696465/f1a1809d6.pdfIn PDF document text
    • https://wudufedowuton.weebly.com/uploads/1/3/2/8/132815791/rozizadove_siwewurusimote.pdfIn PDF document text
    • https://vonulimuwudepaf.weebly.com/uploads/1/3/4/1/134131723/7356612.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/metubevozisul/bisacodyl_davis.pdfIn PDF document text
    • https://s3.amazonaws.com/pajukovuxetu/lab_report_microscopy.pdfIn PDF document text
    • https://s3.amazonaws.com/vofadoloves/161961385.pdfIn PDF document text
    • https://s3.amazonaws.com/busutafitufe/visual_schedule_template_printable.pdfIn PDF document text
    • https://s3.amazonaws.com/farezelof/instagram_logo_sticker.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00010966.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x10966 23164 bytes
SHA-256: 451e1c1b1eaf3289b5e9b9ae0d857031546483082f7aeb20d69ca614f5020c3d
font_00_sfnt_off0000d1eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1EB 5272 bytes
SHA-256: 95f386840f04d0759ef78978ee3507426affbf221e1b79ebf5b8ac369c9b4e7e
font_01_sfnt_off0000e3d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3D1 12072 bytes
SHA-256: 5d31ed42eac20f440110310923cbc8fbd685eec3c20e16f23653bf049b811361

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