Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d1015fddaffa7d4…

MALICIOUS

PDF

81.0 KB Created: 2021-09-21 00:36:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5bb2402ad1ecc4022aca3fdb8973b759 SHA-1: 9a4b9530a8867d1e293c311a8bda88c47e7345a4 SHA-256: 4d1015fddaffa7d4a73331e3b113fd83417e3978dba605f9dab8202bfa7500fb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URLs, many of which are hosted on disposable domains, suggesting a link farm or redirection mechanism. The PDF structure and embedded URLs indicate an attempt to redirect the user to malicious content, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 https://pistant.ru/uplcv?utm_term=physics+for+scientists+and+engineers+tipler+pdf PDF link annotation
    • http://berbun.com/user_img/file/37234277689.pdfIn PDF document text
    • https://thehouseproduction.net/file/pitosexufutezexupuder.pdfIn PDF document text
    • https://pilot-nav.socksnbows.com/ckfinder/userfiles/files/41247856491.pdfIn PDF document text
    • http://tumwebthailand.com/ckfinder/userfiles/files/30624212283.pdfIn PDF document text
    • http://srtprogetti.eu/userfiles/files/45394280116.pdfIn PDF document text
    • http://domadoma.cz/userfiles/file/97808842554.pdfIn PDF document text
    • http://irvinenott.co.uk/ckfinder/userfiles/files/ginokabijopejopavozodiw.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/catnpslqp18b92amfld6tdpjn2/zafetuzagaruseraxaxi.pdfIn PDF document text
    • http://alwaysshine.com/fileimage/file/27164271982.pdfIn PDF document text
    • http://ride.hu/images/uploads/files/vefefed.pdfIn PDF document text
    • http://dobrasekacka.cz/userfiles/file/vekebiburamidodozekak.pdfIn PDF document text
    • https://ndmoyun.com/calisma2/files/uploads/wixamotos.pdfIn PDF document text
    • http://dreamwith.gni.kr/ckupload/files/sebidasakokikigukez.pdfIn PDF document text
    • http://allier-genealogie.org/File:/dunupuxenup.pdfIn PDF document text
    • http://huh.hu/UserFiles/File/xoseni.pdfIn PDF document text
    • http://officeharbor.com/pdtInfo/sarazuxuwetagijilokemumaw.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/161467a67287fa---loxoje.pdfIn PDF document text
    • http://stomerijindex.nl/images/uploads/39335911918.pdfIn PDF document text
    • http://accutindustry.com/Upload/files/20210919224744.pdfIn PDF document text
    • http://bkht.vn/userfiles/file/37592253427.pdfIn PDF document text
    • http://smingames.com/ckfinder/files/2988975891.pdfIn PDF document text
    • http://bafiti.com/sklep/userfiles/file/31397650466.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_off0000d579.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD579 18036 bytes
SHA-256: 24ece7f93a78ab39b716d717d7dbe9cfb51e4665ddf768d2cfa3c8f1bfc6346a
font_01_sfnt_off000104a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011cbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CBE 11012 bytes
SHA-256: 8d51b01684f0e1a14e4b59f90ff3c49398affd634e86cd319417d52adee3f7ce

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