Malicious PDF — malware analysis report

Static analysis result for SHA-256 a57e548b01209697…

MALICIOUS

PDF

82.7 KB Created: 2021-09-14 01:44:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 561ce3faa72688aa24018756316ead2a SHA-1: b18346e51c33f6754b8b2965338a0f28cdeae443 SHA-256: a57e548b01209697e332f2954f96d5c3ccc8c2f638809a2b6c077aea79030ce6
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV detection for Pdf.Phishing.Trojan. The presence of a 'Password-protected archive handoff' heuristic indicates the document likely instructs the user to decrypt or access an archive, a common tactic for evading gateway scanning. Numerous external URLs were extracted, suggesting a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://smidgel.ru/uplcv?utm_term=gta+para+android+gratis+baixar PDF link annotation
    • http://windmill-bv.com/userfiles/files/vixoxejefog.pdfIn PDF document text
    • http://trineckevzdelavani.cz/webpagebuilder/ckfinder/userfiles/files/lelavadiwesetudesa.pdfIn PDF document text
    • http://pazarziraat.com/userfiles/file/59255508312.pdfIn PDF document text
    • http://kfoodntea.com/dataroom/file/87382945264.pdfIn PDF document text
    • https://norservis.cz/files/files/25832984058.pdfIn PDF document text
    • https://pelicanfinancialnetwork.net/ckfinder/userfiles/files/11874234325.pdfIn PDF document text
    • http://enovosti.info/ckfinder/userfiles/files/59480985309.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/tevipubovubakawu.pdfIn PDF document text
    • http://capableapp.com/uploads/files/16754001100.pdfIn PDF document text
    • http://lhdrum.com/User_File/UpFile/file/20210912032217_YmVqaWdveG9waXhpcmltZXhvcGVuZWQ=.pdfIn PDF document text
    • http://mgbig.com/upload_fck/file/2021-9-1/20210901075125499531.pdfIn PDF document text
    • https://fancybox.pamlskovnik.cz/ckfinder/userfiles/files/17729329636.pdfIn PDF document text
    • http://trunghungplastic.com/luutru/files/rufifefef.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/161340673730a9---97555033617.pdfIn PDF document text
    • http://dvif.fr/userfiles/file/31661902000.pdfIn PDF document text
    • http://superbarter.sk/media/file/94226841155.pdfIn PDF document text
    • http://skinct.com/upload_file/file/Fl202109050909276328.pdfIn PDF document text
    • https://golf-tout-terrain.com/publish/page/file/nelijodikivoledabozuwef.pdfIn PDF document text
    • https://alemarferries.alemarsnp.gr/ckfinder/userfiles/files/33445423792.pdfIn PDF document text
    • https://hobbypet.cz/files/file/dijifopo.pdfIn PDF document text
    • http://sd-admin.fazendapenaazul.com/ckeditor/uploads/files/wimadegojorowatiwavuxos.pdfIn PDF document text
    • https://clubsecurite.fr/webroot/upload/files/dasuxusanojikotu.pdfIn PDF document text
    • http://thewhitmerlawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sijemadakejezofano.pdfIn PDF document text
    • https://satuldelut.ro/ckfinder/userfiles/files/23982690249.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_off0000e17b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE17B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f992.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF992 10668 bytes
SHA-256: 40dbcb4a5798b5c7153cf965068bdb81ac113208e8464d75824232a60efc77e8
font_02_sfnt_off000111b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111B1 16776 bytes
SHA-256: 473b90816086d50c99c858148d639ca07fcc30738de61b4b2ad7439454ba0096