Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ac7fa48fa115589…

MALICIOUS

PDF

72.3 KB Created: 2021-09-13 20:03:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3673a63bcae96198387e4924842f4f53 SHA-1: 04679ce2ec5a0b980e8d36bc17bd57b860db6fe1 SHA-256: 1ac7fa48fa11558925c451969bcdf0b417fbacfdf36c00a817953b2f58e1e383
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically identified as a phishing trojan by ClamAV. The document contains a high density of embedded links, many pointing to unknown or potentially malicious domains, suggesting a link farm or phishing lure. The presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly indicate an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://baoholaodong24.baohohoanglong.com/userfiles/file/sutere.pdf In PDF document text
    • https://5a.ro/ckfinder/userfiles/files/21802496122.pdfIn PDF document text
    • http://winso.tw/userfiles/file/4838220549.pdfIn PDF document text
    • https://www.mnogotrop.com/ckfinder/userfiles/files/403559892.pdfIn PDF document text
    • https://yuktogel.com/contents/files/58794682363.pdfIn PDF document text
    • http://olymp-kiev.com/temp/fckeditor/file/85679449992.pdfIn PDF document text
    • http://dpholding.ru/uploads/files/xatofobi.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/161343dc7026fc---9559443887.pdfIn PDF document text
    • http://techsystem.gr/data/uploads/ckeditor/files/zitovizetapimuma.pdfIn PDF document text
    • https://tezerwatch.com/file/upload/files/09-12-20-48-56-11.pdfIn PDF document text
    • https://tallerescarrion.com/uploads/file/23023171541.pdfIn PDF document text
    • http://www.euro-fly.eu/userfiles/files/xuguvijorepogakox.pdfIn PDF document text
    • http://vantaidongsaigon.com/uploads/files/filimolebobaxixa.pdfIn PDF document text
    • http://kleiberit.ru/files/file/regafewedolaxenepefuti.pdfIn PDF document text
    • https://widepolymers.com/userfiles/file/13506036182.pdfIn PDF document text
    • http://romovi.net/sgi_userfiles/userfiles/files/51358172187.pdfIn PDF document text
    • https://totalsewa.com/userfiles/file/67795914696.pdfIn PDF document text
    • http://schoonhovensvrouwenkoor.nl/ckfinder/userfiles/files/23262862204.pdfIn PDF document text
    • http://kimdaiphatsteel.com/Images_upload/files/91140263419.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a9f76ed311---69771368986.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=a+frozen+flower+full+movie+eng+subPDF link annotation
    • 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b5f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5F1 10732 bytes
SHA-256: f500182ac5a2b169a0e5d50743a91db8676d48fb4aff7253ec0322931b34d0db
font_01_sfnt_off0000ceac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEAC 17524 bytes
SHA-256: 8c42474d34a8c232904c51a458e681fa9dae6494301404d1c31859558d2a5f7d
font_02_sfnt_off0000fc0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC0D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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