Malicious PDF — malware analysis report

Static analysis result for SHA-256 53805ee6dfdf85e7…

MALICIOUS

PDF

85.9 KB Created: 2021-09-14 21:32:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 88c2801f83b1e5ec1cf48097849aae28 SHA-1: 789a427c632c7635362a70d1c6643def88a25c16 SHA-256: 53805ee6dfdf85e7eacc932d3f929f25209bf991684a093ddae60231e6ae2d66
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to external sites, suggesting a phishing or malware distribution scheme. The PDF structure and the presence of external links are consistent with spearphishing attachments used to redirect victims to malicious content.

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://krisoc.ru/uplcv?utm_term=how+to+get+stock+android+on+any+phone PDF link annotation
    • https://thepainter.asia/upload/files/resifibenuzeduganita.pdfIn PDF document text
    • https://wroclawmodelshow.pl/ckfinder/userfiles/files/84405454906.pdfIn PDF document text
    • http://chroscina.com/userfiles/file/77784513959.pdfIn PDF document text
    • https://communeouchamps.fr/userfiles/file/lejizudobefife.pdfIn PDF document text
    • http://tuclubcr.com/campannas/file/44598324592.pdfIn PDF document text
    • http://qishuochem.com/siicea/userfiles/file/65610698001.pdfIn PDF document text
    • http://airmon.hu/images/files/49422097547.pdfIn PDF document text
    • http://takramaipai.com/mypicture/file/78725628043.pdfIn PDF document text
    • https://bellcera.60km.com/upload/files/32058588619.pdfIn PDF document text
    • http://dr-temt.ru/images/file/vafide.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a885b77f58---xexofugomuzoderiveno.pdfIn PDF document text
    • http://pegasomeeting.medcoast.net/ckfinder/userfiles/files/limamotowujesagi.pdfIn PDF document text
    • https://verredistri.fr/xmedia/file/runojuwubaf.pdfIn PDF document text
    • http://cherryontop.pl/upload/fotki/file/16981468351.pdfIn PDF document text
    • http://gcsiva.com/files/userfiles/file/pisexixapawotinus.pdfIn PDF document text
    • https://geelaboba.dswip.com/ci/userfiles/files/bubaninafudodafaxopiborag.pdfIn PDF document text
    • http://makeyourpartnermelt.com/userfiles/file/44208297780.pdfIn PDF document text
    • http://vo23.ru/upload/file/10520417602.pdfIn PDF document text
    • https://pvesc.vn/uploaded/file/89774756473.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613da8bd580a6---80868183730.pdfIn PDF document text
    • https://casaalu.com/luutru/files/mewileziw.pdfIn PDF document text
    • https://hunde-katzen.at/soubory/43999284386.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/16139145b565bf---zepopufigititijexot.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_off0000e958.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE958 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001016f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1016F 11028 bytes
SHA-256: 1e8127683c203cd007d3cb82e855eda7173b481445fc28414d16993e032c55bc
font_02_sfnt_off00011ae4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AE4 18076 bytes
SHA-256: d4b444bc69fcd3bac2d7a256ef23336b997183dcb1a95f05b0f3037b55c430d2

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