Malicious PDF — malware analysis report

Static analysis result for SHA-256 d988e9516aac4c77…

MALICIOUS

PDF

82.8 KB Created: 2021-09-11 13:28:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 008d8fb4794a3cef9b7d0fa09ad6c614 SHA-1: a48d89b3d5223dd18c7c400303ecadb829ac50e2 SHA-256: d988e9516aac4c773d7044fd4524f2362bc90cdd20197a5b054a269593c17053
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links on disposable domains, a common tactic for phishing or distributing further malware. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics point towards an attack pattern involving redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://datacomsystems.cz/userfiles/file/20977450571.pdf In PDF document text
    • http://mikol-styl.cz/userfiles/file/93700252669.pdfIn PDF document text
    • https://amigo-shop.105h.net/upload/files/92565885637.pdfIn PDF document text
    • http://mediedil.eu/userfiles/files/62930096391.pdfIn PDF document text
    • http://chp-travel.ir/data/file/21069452300.pdfIn PDF document text
    • http://pass38.com/images/contentimages/files/87321839937.pdfIn PDF document text
    • https://giaphutelecom.com/tctt/sites/aaa/file/nakoxegobajiwafilogiza.pdfIn PDF document text
    • https://egc.ecrom.work/syo/files/80141754315.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16135a855cdf11---24217009992.pdfIn PDF document text
    • http://covina.crazyrockinsushi.com/uploads/files/43844452141.pdfIn PDF document text
    • http://maturitni-ples.eu/UserFiles/File/wawusot.pdfIn PDF document text
    • http://streetnn.ru/data/upload/ck/files/99915179738.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/ec5aa2ecb8d87b46d159f2de6f04a9b0/neragane.pdfIn PDF document text
    • http://woodbridgeabw.com/uploads/files/dagufuramiroremotesenuwil.pdfIn PDF document text
    • http://finance-bulldog.cz/UserFiles/File/38329405444.pdfIn PDF document text
    • http://gd-weimi.com/upfolder/e/files/20210903141412.pdfIn PDF document text
    • http://bestbelly.org/content/files/files/lariwof.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/wutajolinuwakijalumera.pdfIn PDF document text
    • http://nieruchomosciklodzko.pl/files/file/babapej.pdfIn PDF document text
    • https://pensionradvanice.cz/res/file/tipegixigazobiweso.pdfIn PDF document text
    • http://svb-volleyball.de/userfiles/file/wigaruzerutabofotibik.pdfIn PDF document text
    • http://alocainghien.com/uploads/userfiles/file/92625632296.pdfIn PDF document text
    • http://bagodilovaspark.hu/userfiles/file/86867896674.pdfIn PDF document text
    • https://toananhmedical.com/uploads/files/zemoje.pdfIn PDF document text
    • http://kowalstwwo.pl/public/cms/images/file/49398072267.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=best+low+end+pc+emulator+for+pubgPDF 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_off0000df46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF46 17016 bytes
SHA-256: 7e18b86522f630594fc281921f6125cec96c2336f1cb6d4df0b5b9cb5bd896c6
font_01_sfnt_off00010b30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B30 11252 bytes
SHA-256: 43624f24e66e5266fea9ff902a7446a026beb55f466f7e95968d9ad4db311c34
font_02_sfnt_off0001253f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1253F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1