Malicious PDF — malware analysis report

Static analysis result for SHA-256 526eab36a77da36c…

MALICIOUS

PDF

94.4 KB Created: 2021-09-17 08:15:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 187d436a3029f5fab70f57b6eb6c4fe2 SHA-1: a1ca192b674cbfdd777962a294dea0ec0b18ee9c SHA-256: 526eab36a77da36c1dac0811682c8e91bf75aa7b14be39883ac78b5273c251c0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the nature of the link farm suggests it's designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://nomylo.ru/uplcv?utm_term=turn+based+strategy+games+2021 PDF link annotation
    • http://fecirturizm.com/resimler/files/berozagumupakutapom.pdfIn PDF document text
    • https://doan295doson.vn/namthuan/images/news/files/74263509554.pdfIn PDF document text
    • http://torby.kbo.pl/ckfinder/userfiles/files/58001261097.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1612f7e2922926---39088132407.pdfIn PDF document text
    • http://studiophotosfashion.it/userfiles/files/34358381636.pdfIn PDF document text
    • https://mantyobras.com/userfiles/file/gegiwobi.pdfIn PDF document text
    • https://angem.fr/userfiles/file/55174152410.pdfIn PDF document text
    • https://onlinendttraining.net/files/dumitibilifug.pdfIn PDF document text
    • http://aircond.md/upload_fck/file/19258222724.pdfIn PDF document text
    • http://ototavandosemesi.com/resimler/file/80522000294.pdfIn PDF document text
    • http://klick-tipp.info/ckfinder/userfiles/publics/files/kixewofisitotipo.pdfIn PDF document text
    • https://copab.tn/216mag.svn/uploads/files/vezitomunuzofire.pdfIn PDF document text
    • https://greenfins-thailand.org/uploads/file/pulusiwezotifafofuxanelop.pdfIn PDF document text
    • https://nisahanpin.com/calisma2/files/uploads/7566826534.pdfIn PDF document text
    • https://radekslodkiewicz.pl/files/file/99962313768.pdfIn PDF document text
    • http://woori-tour.kr/FileData/ckfinder/files/20210904_BBE286E0429C15DC.pdfIn PDF document text
    • http://jmyhship.com/uploadfile/files/mejidatodepujifopojitil.pdfIn PDF document text
    • http://regmac.net/userfiles/files/delazoraxol.pdfIn PDF document text
    • http://falerisztika.hu/tmp/75525280517.pdfIn PDF document text
    • http://geometramaurotozzi.it/userfiles/files/63921802187.pdfIn PDF document text
    • https://hsiaoying.com/userfiles/file/dituzon.pdfIn PDF document text
    • http://sjhtractor.com/d/files/22282951628.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://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_off00010d14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D14 17580 bytes
SHA-256: d91901251e1ca49ed7e8d9b1929becf1800ffadf0705d663ac48f172fa976db6
font_01_sfnt_off00013af2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AF2 10944 bytes
SHA-256: 409cf5bebc9afad73148a7b46dd6905e1a75bacbbed67d3d09b9dcf58a36fec1
font_02_sfnt_off00015440.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15440 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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