Malicious PDF — malware analysis report

Static analysis result for SHA-256 231b220b806d4e90…

MALICIOUS

PDF

73.7 KB Created: 2021-04-27 14:32:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 5b34dd119207e2406f664d22ce392151 SHA-1: 42e78b69041d004b8e07d49ebc34d7ff6f134aa7 SHA-256: 231b220b806d4e90c7a18afc29bec85fc13c3d3781c57af2f334459f5f7a3da1
164 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. It uses an invoice-themed lure. 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-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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://botokaw.ru/strik?utm_term=how+to+record+dividend+from+subsidiary PDF link annotation
    • https://gikotibosad.weebly.com/uploads/1/3/4/3/134332820/1136028.pdfIn PDF document text
    • https://fabezetenonuke.weebly.com/uploads/1/3/4/8/134846610/5530729.pdfIn PDF document text
    • https://kafunuxuvivupar.weebly.com/uploads/1/3/5/3/135303333/82285b8f.pdfIn PDF document text
    • http://sifaritube.sportsontheweb.net/bakekuzonezemuposusudase.pdfIn PDF document text
    • https://serofewaz.weebly.com/uploads/1/3/1/3/131379274/muvuratuvazakono.pdfIn PDF document text
    • https://taxezuwijukiwum.weebly.com/uploads/1/3/1/6/131606901/854981.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/vizegemawokaxe/31491500896.pdfIn PDF document text
    • https://b1c30c75-ab46-439a-884d-3836ae4b8a49.filesusr.com/ugd/2d1648_aa60aa505eb74d15bd29738d67c7aa57.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wujanozo/fangshi_limcube_deformed_3x3_centrosphere.pdfIn PDF document text
    • https://f815f12b-539f-4060-8ed9-abd2caada31b.filesusr.com/ugd/ceb2e8_f9caed200f484820acf99d34208168a0.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mivokozibu/how_do_you_hook_up_a_portable_dishwasher_to_a_faucet.pdfIn PDF document text
    • https://e6676b24-921d-4f57-8fca-beda98688f3c.filesusr.com/ugd/144d27_6a9b6403ff064d12818950e436515275.pdf?index=trueIn PDF document text
    • http://laxuzoto.onlinewebshop.net/the_odd_couple_theme_song_name.pdfIn PDF document text
    • https://b9e1b105-38e0-4bbf-baad-90de1e2021e1.filesusr.com/ugd/432b07_61e1f3dea67942e89dda05e83f1bc4e8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/votubukaxogilix/camp_rock_fire_and_rain_song.pdfIn PDF document text
    • https://b2f02272-107b-4032-aafc-54cdd6265a16.filesusr.com/ugd/6cf392_d68762c9c6104374a44630b504f3b32e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vuraradaso/93274610368.pdfIn PDF document text
    • https://d6aab468-caab-4d9e-910f-d3bf64ae4104.filesusr.com/ugd/5438e3_8d8c75602a51490dbf6c592cf40bfb68.pdf?index=trueIn 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_off0000e236.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE236 5488 bytes
SHA-256: e0b0e2874af65af468f6b7dbcc3fca94cefcc1f74bcae7bcddce5cce134c6f16
font_01_sfnt_off0000f4e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4E6 10676 bytes
SHA-256: b1f1d4fc246b1b7c1e7cee020690036c064f849cace3338e8cc98a8d5fe5cd22

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