Malicious PDF — malware analysis report

Static analysis result for SHA-256 887afc9a57eb218c…

MALICIOUS

PDF

88.1 KB Created: 2021-09-08 21:33:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3ec0d2765b04f0118d0cb2add62c5050 SHA-1: b2cadb70dd246cb88c095053cef164ef5cb7370b SHA-256: 887afc9a57eb218cd773eb1e6a195f1b758daf2e6433dbddc2315991834d71bb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, presenting numerous URLs that likely lead to phishing or malware distribution sites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, identifying the document as a non-clustered link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://queure.ru/uplcv?utm_term=slack+chambers+johnston+operations+management+pdf PDF link annotation
    • http://yogaschoolofkerala.com/photos/editor/files/zanufoxapokat.pdfIn PDF document text
    • http://5lovestartw.com/CKEdit/upload/files/84295534038.pdfIn PDF document text
    • http://lyzjkgm.com/d/files/xixax.pdfIn PDF document text
    • http://solmoda.it/userfiles/files/zotegigesanujej.pdfIn PDF document text
    • http://www.sospapa24.com/lib/ckfinder/imgupload/files/13667900134.pdfIn PDF document text
    • http://equipociclistaugeraga.com/ciclistas/userfiles/file/datidejadawa.pdfIn PDF document text
    • http://abworder.com/uploads/files/90452970971.pdfIn PDF document text
    • http://kuresi-kaitori.com/upload/content_pic/files/36246265574.pdfIn PDF document text
    • http://zkojicin.cz/userfiles/file/pamuritipatomivokibavig.pdfIn PDF document text
    • https://swagath.co/new/ckfinder/userfiles/files/67243044529.pdfIn PDF document text
    • http://fulns.com/uploadfile/fckedit/file/1631062332bkSm.pdfIn PDF document text
    • http://dpsszczytno.pl/photo/file/vowojirubonolalaxujudipir.pdfIn PDF document text
    • https://extremedriveline.com/ckfinder/userfiles/files/80113170173.pdfIn PDF document text
    • http://tecs4.com/intranet/ckfinder/userfiles/files/naxesufamariwarusoz.pdfIn PDF document text
    • https://cuichi177.com/uploads/files/202109040107055390.pdfIn PDF document text
    • http://a-swiss.com/upload/userfiles/file/maziv.pdfIn PDF document text
    • http://sarkar.ie/userfiles/file/44240582700.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/161313c1301081---67301328526.pdfIn PDF document text
    • http://consulcongress.it/uploads/assets/file/tiwadufanilapusogatep.pdfIn PDF document text
    • https://resortweeks.pro/userfiles/file/62464658854.pdfIn PDF document text
    • http://chekeeh.ir/basefile/chekeehir/files/bosafokinimezofun.pdfIn PDF document text
    • https://photojet.net/userfiles/file/17566960995.pdfIn PDF document text
    • https://tiklatakip.com/calisma2/files/uploads/vojapodit.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_off0000ea9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA9B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000102ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102AD 20384 bytes
SHA-256: 80ae2f78fe4baf9a056df9b50e5e7ee1b45567d3a35cde978d8728e12fb6f751
font_02_sfnt_off0001379c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1379C 11504 bytes
SHA-256: 55ccb25889db8d91cb0823b08074dff82ce9741ce561f16c95835e631b4d607a

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