Malicious PDF — malware analysis report

Static analysis result for SHA-256 1255d0f072b2cc63…

MALICIOUS

PDF

83.5 KB Created: 2021-09-09 12:07:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a867f88da644d43ac79261c59041b7b6 SHA-1: 1fd7a7725df9b2f7ecc2eaf76588c00362e26319 SHA-256: 1255d0f072b2cc6310092946b78df3fa650de646333036db8680a8906c05bf57
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to suspicious domains, and one heuristic identified it as a link farm on disposable hosting. While no scripts were explicitly extracted, the nature of the embedded URLs and the link farm heuristic suggest an attempt to redirect users to malicious sites or distribute further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 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 http://findmealocalpainter.com/insurazon/admin/userfiles/file/62151154029.pdf In PDF document text
    • http://www.mueblesgamez.com/ckfinder/userfiles/files/92199678432.pdfIn PDF document text
    • http://speckrepej.com/upload/file/74062377672.pdfIn PDF document text
    • http://mylodge-naoshima.com/24053776436.pdfIn PDF document text
    • https://tekmaker.com/upload/files/82904594895.pdfIn PDF document text
    • https://ost-fogging.com/upload/files/41919684541.pdfIn PDF document text
    • http://cp-1.ru/userfiles/files/66196637151.pdfIn PDF document text
    • https://fratellifurloni.it/file/80858097668.pdfIn PDF document text
    • https://stockbauer.hu/uploads/file/vudagogen.pdfIn PDF document text
    • https://burstallconrad.com/editor_files/file/78710901920.pdfIn PDF document text
    • https://clinicaalcantara.es/sites/default/files/userfiles/file/dorudap.pdfIn PDF document text
    • https://studiopros.com/userfiles/file/In PDF document text
    • https://leresto-niort.fr/images/userfiles/files/wuvudavirevilukosikube.pdfIn PDF document text
    • https://fivetc.net/uploads/files/34416561034.pdfIn PDF document text
    • https://majubesar.net/contents/files/wevuru.pdfIn PDF document text
    • http://sculecuacumulator.ro/app/webroot/files/userfiles/files/82030503510.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130aff54315d---18522256473.pdfIn PDF document text
    • http://swapnakoodu.com/fck_uploads/file/42894768145.pdfIn PDF document text
    • http://form4concrete.ru/pics/cont/file/63417245461.pdfIn PDF document text
    • https://brianhigbielaw.com/UserFiles/file/73320766179.pdfIn PDF document text
    • http://szjg.hu/images/file/78967536558.pdfIn PDF document text
    • http://anbao.vn/uploads/userfiles/file/4553305100.pdfIn PDF document text
    • https://gangwontaxi.com/FileData/ckfinder/files/20210901_D9C88ED75B57C0AA.pdfIn PDF document text
    • http://zatexpress.com/upload/userfiles/files/dosesivupusotidunodirib.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=wlan+schl%C3%BCssel+auslesen+androidPDF 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_off0000da8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA8B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f29d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF29D 20248 bytes
SHA-256: 455ae948caba28997de16128bd32aa82fba43a03c75fe1aaeabb2ec9af9cab22
font_02_sfnt_off000126b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126B4 10656 bytes
SHA-256: 044d8f7b63c4eefd503db7cde891113a824e55302c1507b774840ce1c6a5622a

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