Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1a1e8deac034c10…

MALICIOUS

PDF

82.5 KB Created: 2021-09-09 02:10:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: 1c2bf4e067746063c53f4ac8dbe7bf6b SHA-1: 8e57cea237dea8cbcafa0323c211a3b319ec5bc0 SHA-256: c1a1e8deac034c10ea5b033f0b4e22e4681999ca3efb1ef81aed2567aeda8fa2
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The sample is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it's a link farm designed to host PDF files. The 'SE_ENABLE_LURE' heuristic suggests the document's content prompts the user to enable macros or editing, a common tactic for malware droppers. While no scripts were extracted, the overall structure and heuristics point to a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • 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.
  • Macro/content-enable lure medium SE_ENABLE_LURE
    Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings
  • 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://pensiuneaselina.ro/userfiles/file/19550767535.pdf In PDF document text
    • http://findusafranchise.com/files/files/pusejoveb.pdfIn PDF document text
    • https://fuze-pay.com/ckfinder/userfiles/files/11210032562.pdfIn PDF document text
    • https://vegan-eshop.cz/data/file/takorozedelakufi.pdfIn PDF document text
    • https://willes-gb.com/uploads/files/202109021347251005.pdfIn PDF document text
    • https://episcopiaoradiei.ro/files/sekidupuxovi.pdfIn PDF document text
    • http://dylogistics.com/userData/board/file/tatiputebig.pdfIn PDF document text
    • http://daeryuhealthcare.com/ckupload/files/buxovolus.pdfIn PDF document text
    • https://kurek-rowery.pl/user_pict/file/makavizivovopofumibexu.pdfIn PDF document text
    • http://rootbeadmill.com/upload_fck/file/2021-9-9/20210909051912368929.pdfIn PDF document text
    • http://yuqiaohome.com/uploads/files/202109010450565165.pdfIn PDF document text
    • http://wanyuantemple.tw/userfiles/file/56561841478.pdfIn PDF document text
    • http://equipociclistaugeraga.com/ciclistas/userfiles/file/zipotezolusironemezuzezu.pdfIn PDF document text
    • https://anjingliar2.com/contents/files/nuvimu.pdfIn PDF document text
    • https://sona3elkhair.com/userfiles/file/16205394729.pdfIn PDF document text
    • http://wwpokebar.com/uploads/files/zikapadokuvoturutawuxi.pdfIn PDF document text
    • https://tucarrorentacar.co/ckfinder/userfiles/files/xepuruteligemuke.pdfIn PDF document text
    • https://gamma-electronics-eg.com/userfiles/files/79400155625.pdfIn PDF document text
    • https://livstyle.ro/home/livstyle/public_html/uploads/files/dijulutevav.pdfIn PDF document text
    • https://hostsolutions.ro/app/webroot/files/userfiles/files/19686237426.pdfIn PDF document text
    • http://cleanyachts.it/writable/public/userfiles/file/paxitesamuwejitetovomar.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=apk+source+code+editorPDF 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_off0000db68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB68 10368 bytes
SHA-256: ba89678d3cfe0169eed7da1fa5034bbb0c2ae77367aa3156de2e3b7e75eec6aa
font_01_sfnt_off0000f309.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF309 18956 bytes
SHA-256: 75b8dbc394afb83f1a98ca4b3393cd5583b118f7c1a760d0731781551ff6e6a8
font_02_sfnt_off000124b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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