Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac18afe635e5dfe2…

MALICIOUS

PDF

84.7 KB Created: 2021-09-10 12:05:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8d56a41a5187659801a35968d0daed20 SHA-1: a2f97bbd69d3556382bf1d9a9ec65f27983f1c0b SHA-256: ac18afe635e5dfe2831dc55a41a828481768ff17f87a14f725c7b4c896cccee8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many of which point to disposable hosting or are part of a link farm, indicating a strong phishing or malware distribution intent. The document body is heavily obfuscated and unreadable, suggesting it is not intended for user interaction beyond clicking the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://krisoc.ru/uplcv?utm_term=risk+game+on+android PDF link annotation
    • http://apexibd.com/uploads/fck_uploads/file/paboxaratona.pdfIn PDF document text
    • http://g-shocktou.com/user_file/file/14445100813.pdfIn PDF document text
    • https://cedria.es/DOCUMENTS/FotosFCKEditor/file/237177803.pdfIn PDF document text
    • http://manegedebuitenwijck.nl/uploads/file/47491033113.pdfIn PDF document text
    • http://dlzj.net/upload/files/20210906101754676203.pdfIn PDF document text
    • https://pecintajp.com/contents/files/kajonowepamopar.pdfIn PDF document text
    • http://studio-castiglioni.com/userfiles/files/62019067168.pdfIn PDF document text
    • http://canxetaidientu.com/images/file/wujivabukazo.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/16133c6d2d8ad6---niwiv.pdfIn PDF document text
    • https://envida-nieuws.nl/bsb_website/upload_fck/file/refezukodukuganazepibejez.pdfIn PDF document text
    • http://njbeihang.com/uploadfile/file///2021090520513036.pdfIn PDF document text
    • https://ou-ravda.com/ckfinder/userfiles/files/78781421072.pdfIn PDF document text
    • http://carnavaldemarbella.com/Senegal_5/Content/files/userfiles/file/sikadegik.pdfIn PDF document text
    • http://dydlhx.com/upfiles/file///27772830920.pdfIn PDF document text
    • https://pmapmc.com/userfiles/image/files/77498631303.pdfIn PDF document text
    • http://hanstime.com/userData/board/file/gukoziluforutivuvis.pdfIn PDF document text
    • http://flemingdecal.com/uploads/assets/file/80089401881.pdfIn PDF document text
    • https://htijsr.com/userfiles/file/65159791991.pdfIn PDF document text
    • http://dichvutheapec.com/upload/FCK/file/2012410390.pdfIn PDF document text
    • http://faisaltowel.com/survey/userfiles/files/59880029465.pdfIn PDF document text
    • http://botaierpharm.com/upload/files/85036054796.pdfIn PDF document text
    • http://yh-nutri.com/filespath/files/20210902192416.pdfIn PDF document text
    • http://tlumacz-francuskiego.pl/userfiles/file/39136722076.pdfIn PDF document text
    • http://www.drivingschool-brno.cz/files/files/keveto.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_off0000e705.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE705 17760 bytes
SHA-256: c2fd311f6e34db983431b9f22584c263853e8b1305dbde0458b764093fa99cd2
font_01_sfnt_off00011504.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11504 10584 bytes
SHA-256: bb28488f625c9082006c5d5d771e8f9c57b8e213014701bea11d5518c3c93cc7
font_02_sfnt_off00012ceb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CEB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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