Malicious PDF — malware analysis report

Static analysis result for SHA-256 b29180f35f39c759…

MALICIOUS

PDF

83.8 KB Created: 2021-09-19 17:48:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 949e2a8d155f57d276560084487b13a4 SHA-1: 9d1ac062e0f41550ecc36b208c42ebf511c391e6 SHA-256: b29180f35f39c759650b37173f0115e75d854c44945a02063b100dc8be35f47a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It contains numerous embedded URLs, with the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically identifying it as a link farm on disposable hosting, likely intended to redirect users to malicious sites. Although no scripts were explicitly extracted, the nature of the embedded URLs and the link farm heuristic suggest an attempt to lure users into executing further malicious content or providing sensitive information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8881

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://bud-drog.pl/userfiles/file/ridukiradogab.pdf In PDF document text
    • https://leosservices.com/userfiles/file/wukanivilofoxalivawalowo.pdfIn PDF document text
    • http://seattlebestteriyaki.com/uploads/files/80559658348.pdfIn PDF document text
    • http://kozszemle.hu/uploads/files/noxidinanodowis.pdfIn PDF document text
    • https://dansobentre.net/uploads/file/sisijadisiwavap.pdfIn PDF document text
    • http://studiofelician.com/userfiles/files/79916594606.pdfIn PDF document text
    • http://gpkoaee.ru/ckfinder/userfiles/files/53663591229.pdfIn PDF document text
    • http://wamaeassociates.com/images/uploads/originals/file/46097349787.pdfIn PDF document text
    • https://www.larche-de-jules.fr/ckfinder/userfiles/files/9113825832.pdfIn PDF document text
    • https://dzido.pl/userfiles/file/xobawosivovixajajalugus.pdfIn PDF document text
    • https://eminenceconstruction.ca/viking1/uploads/files/91519620027.pdfIn PDF document text
    • https://georeno.ca/userfiles/files/2309007759.pdfIn PDF document text
    • http://zhodnoceni-penez.cz/is/images/FCKeditor/File/99071107262.pdfIn PDF document text
    • http://condosworld.com/abisol1/userfiles/files/ritavarofuxewosopizowogew.pdfIn PDF document text
    • https://askisan.com/upload/ckfinder/files/dibirif.pdfIn PDF document text
    • http://nwhouse.ru/uploads/file/34280987967.pdfIn PDF document text
    • http://meruzhankhachatryan.com/app/webroot/files/file/27136841726.pdfIn PDF document text
    • https://regaluxiluminacion.com/uploads/assets/file/53778537762.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16137057b4bffc---6057795607.pdfIn PDF document text
    • http://japanbizkorea.com/userData/ebizro_board/file/risutadef.pdfIn PDF document text
    • http://pmke.cz/pictures/files/tenaxupefefazebuti.pdfIn PDF document text
    • http://brucemayrockinstitute.com/assets/ckfinder/core/connector/php/uploads/files/58086710124.pdfIn PDF document text
    • http://80tner.friend-match.com/upload/files/4746013117.pdfIn PDF document text
    • https://turkuazhost.com/calisma2/files/uploads/lilenejadigasako.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=android+app+release+checklistPDF link annotation
    • 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_off0000ea14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA14 18056 bytes
SHA-256: 010ab80c89b9d2f81fb225132c79c52ac118ba9b4ffcc9fa460822b1dbca5173
font_01_sfnt_off000118f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001310a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1310A 10684 bytes
SHA-256: 96f0ca3e2bc926d14efc602b56f746e06eac28f19d92e3e88c3ac89a90a3e05a