Malicious PDF — malware analysis report

Static analysis result for SHA-256 faedd40ca640a402…

MALICIOUS

PDF

81.5 KB Created: 2021-04-18 05:16:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 18b94dc545274ce0d13419c119301fab SHA-1: 18d61c10a598b357f663373943526fcfb8154518 SHA-256: faedd40ca640a4020e899f1785010dcfad221b3f0ed916b42ae01f1be5833175
226 Risk Score

Malware Insights

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

The PDF document contains numerous embedded links to external websites, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as a phishing or trojan PDF. The presence of multiple suspicious URLs and the PDF_SEO_LINK_FARM heuristic suggest a campaign to distribute malicious content or phish for information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 7

  • 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-heavy PDF with invisible link to suspicious domain high PDF_SUSPICIOUS_LINK_LURE
    PDF is a small image-heavy lure with invisible link annotations that send the user to a suspicious high-risk-domain URI. This matches credential-phishing carriers where the visible document is only a prompt and the real collection flow happens on the linked website.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://nipisod.ru/strik?utm_term=canon+rebel+t5i+18mp+dslr+camera PDF link annotation
    • http://fujenotaj.22web.org/43952708453.pdfIn PDF document text
    • https://cdn.sqhk.co/nelufebo/iewrfoM/33025326250.pdfIn PDF document text
    • https://cdn.sqhk.co/jarixizotib/fgcghij/688680821.pdfIn PDF document text
    • http://gopexilif.22web.org/86144771618.pdfIn PDF document text
    • https://cdn.sqhk.co/zanuvajebodu/jbZ6Cic/bosutidajeja.pdfIn PDF document text
    • http://tigimurudel.22web.org/kadonomuxegadorepinaw.pdfIn PDF document text
    • http://carinsusa.info/spectrum_math_workbook_grade_8_free92cvz.pdfIn PDF document text
    • http://bbcua.site/nipisuvohu5yz.pdfIn PDF document text
    • http://fruitslope.online/honourable_woman_episode_3_guidewskg0.pdfIn PDF document text
    • http://ig-supportcenter.xyz/762132287791ybq6.pdfIn PDF document text
    • https://cdn.sqhk.co/jotoselu/Ehhnjhj/54189504314.pdfIn PDF document text
    • https://cdn.sqhk.co/tajiwikiter/gsgfFic/56344232749.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://893c8be9-d140-4a04-8a3e-66bd54b472cd.filesusr.com/ugd/efd7ea_6bb75fc188664059b511c4d55aea6402.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xezonijida/microbes_and_ecological_theory.pdfIn PDF document text
    • http://lubudag.epizy.com/fadafonuto.pdfIn PDF document text
    • https://98350ace-7ac4-4f38-a9d9-579fdad8050b.filesusr.com/ugd/9b2d9b_48f11c64560f4616b3eba6ad6a8b81ac.pdf?index=trueIn PDF document text
    • http://rulixazani.rf.gd/alphabet_pictures_for_each_letter.pdfIn PDF document text
    • https://a32e93c2-1aa3-4149-af29-aa5d163ab988.filesusr.com/ugd/40336e_410a1bf2fa524b12b07e7de4ab2ca2bf.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gopifu/aol_desktop_software.pdfIn PDF document text
    • https://254b3b0b-79dc-4992-827c-fd4bb3db3178.filesusr.com/ugd/f515ca_071d1cf111c64b6988c2f8df8d896ccb.pdf?index=trueIn PDF document text
    • http://galapor.rf.gd/36303087079.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_off0000fde1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDE1 5632 bytes
SHA-256: 96d656d174d31f8e2694cb5afc5048d8b9c307cc11968d61fc34ed63db2dbe62
font_01_sfnt_off000110f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110F9 11048 bytes
SHA-256: dcf4952bff62830787d217c5cc67502b152ef2f06eb3b1566b6acfd39c3a8861

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