Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1808bb5d8b8e236…

MALICIOUS

PDF

82.5 KB Created: 2021-09-08 21:17:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: 6f5d88198cf04894244fac744f780c11 SHA-1: 801abc0f40de67bfe7c9e7a77d8ac685dd833fb9 SHA-256: f1808bb5d8b8e2364d4ea7e2b19a6695e6bed7110fc2238776cff4971cdce369
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://gleb777.com/fck_upload/file/66332560174.pdf In PDF document text
    • http://revucue.com/ckfinder/userfiles/files/22136820617.pdfIn PDF document text
    • http://salsainkonstanz.de/media/files/jared.pdfIn PDF document text
    • http://rent2day.ca/ci2/userfiles/files/82979402445.pdfIn PDF document text
    • https://springkasteelhuren.be/userfiles/file/65233525255.pdfIn PDF document text
    • https://jvlegacyhomerepairsmd.com/nbloom/fckuploads/file/59178354269.pdfIn PDF document text
    • http://agriturismocorteerbatici.it/userfiles/files/58027711994.pdfIn PDF document text
    • http://kasargod.net/uploads/file/33314980340.pdfIn PDF document text
    • http://kripasec.com/userfiles/file/tetixigurudikowadak.pdfIn PDF document text
    • https://dalnoboy.com/data/filestorage/upload/files/dunojiz.pdfIn PDF document text
    • http://huarui-bio.com/upload/files/relatiwisujo.pdfIn PDF document text
    • http://ucinnovation.ru/admin/ckfinder/userfiles/files/57501899620.pdfIn PDF document text
    • https://selapro.com.au/application/third_party/ckfinder/userfiles/files/57377140988.pdfIn PDF document text
    • https://mobisteelegypt.net/userfiles/file/53588514348.pdfIn PDF document text
    • https://beautydent.hu/editor_up/79427764395.pdfIn PDF document text
    • https://rougezenekar.hu/files/file/vezedorejajuvamuno.pdfIn PDF document text
    • http://www.pzkexie.com/up_files/file/29194997785.pdfIn PDF document text
    • https://doctorchina168.com/upload/files/94374492028.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138606b7cf8e---tobike.pdfIn PDF document text
    • http://skupka23.ru/upload/m/gexuwaxenivuxakavusi.pdfIn PDF document text
    • http://canoeing.by/pics/files/6540932440.pdfIn PDF document text
    • https://trompis-tondschungel.de/userfiles/file/24953049200.pdfIn PDF document text
    • http://droprint.my/home/ququ4923/public_html/userfiles/file/79126737557.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612f35c231eb2---wuruxoniwuwolev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=companion+planting+guide+pdfPDF 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_off0000de88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE88 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f69f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF69F 10704 bytes
SHA-256: b14d48fbdc0108b0ba8ccbc45765baff3f8cceddf7465ca01c7aec7ae7a3bff3
font_02_sfnt_off00010eee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EEE 17704 bytes
SHA-256: 965c5a913ebb8ea379e856e3196e7ee064e546927531431fccac2e5e9116359d

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