Malicious PDF — malware analysis report

Static analysis result for SHA-256 77c8826c5ea27e0c…

MALICIOUS

PDF

82.3 KB Created: 2021-09-14 12:04:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 49e860a511b0453400d8bbd4946f4909 SHA-1: ddfa715d13df5f315d1f0dcee83125823fedf52f SHA-256: 77c8826c5ea27e0c117e55d8d0e943c3d07b56f7d048b6a6151b0d714473f20b
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of numerous external URIs, including a link farm on disposable hosting, suggests an attempt to redirect users to malicious websites. The 'SE_URGENCY_LURE' heuristic further supports the phishing pretext, indicating the document likely contains urgent language to prompt user interaction.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://wastran.ru/uplcv?utm_term=android+for+windows+pc PDF link annotation
    • https://gedayapi.com/userfiles/file/19000935708.pdfIn PDF document text
    • http://henca.com/files/details/file/zexisarosezoviwexe.pdfIn PDF document text
    • http://dr-onesrl.com/userfiles/files/7794100871.pdfIn PDF document text
    • http://thanglong.vn-greenenergy.com/ckfinder/userfiles/files/zizuzafulivubowiwibetoso.pdfIn PDF document text
    • http://primaneighbors.com/userimages/56374737825.pdfIn PDF document text
    • https://ego-sofa.tw/uploads/files/202109030602323455.pdfIn PDF document text
    • http://st-johnson.com/Uploadfiles/files/90673549237.pdfIn PDF document text
    • http://cukrarska-vyroba.cz/UserFiles/File/puvifoforewaxuvibole.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16135c254a7c61---zekaxukutufupisanukub.pdfIn PDF document text
    • http://wpchkg.com/upload/image/file/59351989305.pdfIn PDF document text
    • http://fijiembajak.com/uploads/ck_uploads/files/funirorenigiravusakev.pdfIn PDF document text
    • https://himalayanwanderer.com/himalayan/userfiles/files/fefipotedezum.pdfIn PDF document text
    • http://stainless-faucet.com/uploads/htmlupload/files/noxos.pdfIn PDF document text
    • http://chapaconoticias.com/assets/ckfinder/core/connector/php/uploads/files/wamejegaw.pdfIn PDF document text
    • http://birizgardenhotel.com/userfiles/file/14623463156.pdfIn PDF document text
    • http://fresh-j.info/images/uploadedimages/file/bopijo.pdfIn PDF document text
    • https://kitapkapla.com/upload/ckfinder/files/78971424799.pdfIn PDF document text
    • https://keongracun.org/contents/files/bamujabadalesopunulutasu.pdfIn PDF document text
    • https://numen-wow.com/userfiles/cloud/files/xasizew.pdfIn PDF document text
    • http://potya.com/43226334839.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/16132faedcb550---rofaxuvip.pdfIn PDF document text
    • http://b40555.handyfriendship.com/upload/files/jexinamevideroxu.pdfIn PDF document text
    • http://lejonhund.com/upload/riribumezevubofa.pdfIn PDF document text
    • https://himalayanwanderer.com/himalayan/userfiles/files/97843991028.pdfIn PDF document text
    • https://fotobolfestmeny.hu/mvc/userfiles/file/4360508435.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_off0000de80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE80 18036 bytes
SHA-256: 1eca99377ac8a9083a1eb79a076fb1903c6891ea82bac15d6ff0c357339dffca
font_01_sfnt_off00010c7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C7C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012493.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12493 10240 bytes
SHA-256: f49bab98e90e443a618a05e8ae4a1083214e73e912be2e130e5dda8a001c4b06