Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fb9cd4ee45f9931…

MALICIOUS

PDF

86.9 KB Created: 2021-09-20 00:52:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a3750c2cb7d083da272653d93ae2a602 SHA-1: 43ea1cea0d2a4ac5b8456f19ccef503ea644d259 SHA-256: 6fb9cd4ee45f99310ee88950dee3712370468c8c601530e75c09fdbb632bcb7e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier assigned a high probability of maliciousness. It contains numerous embedded URLs, many of which point to PDF files on various domains, suggesting a link farm or redirection mechanism. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates a pattern of using disposable hosting for these links, commonly seen in phishing campaigns.

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 http://freestyler.cz/img/file/55013784201.pdf In PDF document text
    • http://bezagsecurity.cz/userfiles/mozizusaro.pdfIn PDF document text
    • https://swaarm.de/app/webroot/upload/files/17677980419.pdfIn PDF document text
    • http://tinavaron.com/ckfinder/userfiles/files/begemus.pdfIn PDF document text
    • https://karinbentum.nl/uploads/file/34009294198.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/gojewonapuvisuzawaxegapok.pdfIn PDF document text
    • http://ei-windykacja.pl/upload/file/57142600853.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/161416bb90b037---86462043126.pdfIn PDF document text
    • http://ttc-investco.com/img/files/19721103407.pdfIn PDF document text
    • http://hyundainhapkhau.net/upload/files/sewerizodeviz.pdfIn PDF document text
    • http://orderkai.com/uploads/files/xiragarilapat.pdfIn PDF document text
    • http://globalbando.com/DATA/upload/files/202109190447544045.pdfIn PDF document text
    • http://sov.tranovice.org/webpagebuilder/ckfinder/userfiles/files/doxebafuzomazim.pdfIn PDF document text
    • http://seattleteriyaki3.com/uploads/files/pifepidomoso.pdfIn PDF document text
    • http://justsayhi365.com/uploads/file/tusafasarogimakawod.pdfIn PDF document text
    • https://kapefashion.com/files/files/13823724373.pdfIn PDF document text
    • http://www.serge-valentin.net/ckfinder/userfiles/files/39632269472.pdfIn PDF document text
    • http://crm333.com/documentos/file/33191039833.pdfIn PDF document text
    • http://dongzzang.com/userfiles/file///38736769930.pdfIn PDF document text
    • http://springgalleryng.com/Images_upload/files/67487561998.pdfIn PDF document text
    • http://cnsgafgl.netsociality.com/upload/files/45439687880.pdfIn PDF document text
    • http://jikaramen.com/uploads/files/74188280583.pdfIn PDF document text
    • https://yocarbroker.com/upload/ckfinder/files/gibodazuxix.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=android+engineer+salaryPDF 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_off0000f56a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF56A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010d81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D81 10420 bytes
SHA-256: 187bbc8cad557f9e2f96d7ada6ffbc0e13eb50b014f6b12798026c6f8509439a
font_02_sfnt_off000124fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124FA 16016 bytes
SHA-256: a61e85f3ba27e6aa87be04f4aa27900d27f7a6320274c81b8f4ffd3bc5806904

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