Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2f6fd9a070cea0b…

MALICIOUS

PDF

90.8 KB Created: 2021-09-21 16:02:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: a89c326a9893bc2c5cc75ec033df1087 SHA-1: e476822b5197d5b23e016ec78bd354c8a2f330c3 SHA-256: f2f6fd9a070cea0b9c074af7d36d49055823194b29ca628380f572247c160005
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The PDF contains numerous embedded URLs, many of which point to disposable domains, indicating a link farm designed to obscure the ultimate destination. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it is designed to exploit vulnerabilities or redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://reliancefla.com/admin/images/file/7258029774.pdf In PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/a5516be6225e8fde02d88899d2e15785/gabogagikabezewazepewi.pdfIn PDF document text
    • http://kalikraft.com/images/file/60669610962.pdfIn PDF document text
    • http://satit.nrru.ac.th/satit/_Adminis/ckfinder/userfiles/files/jamilejanefiremogomonepip.pdfIn PDF document text
    • http://lagrupacio.cat/file/vaxugerowivazavusu.pdfIn PDF document text
    • http://yunnanyingxiang.com/ckfinder/userfiles/files/14100120340.pdfIn PDF document text
    • https://thuanxuongmonmb.com/admin/webroot/upload/image/files/97781102816.pdfIn PDF document text
    • http://floridadressyourhome.com/uploaded_files/userfiles/files/towig.pdfIn PDF document text
    • http://hyunbulsa.org/~ewedd2/userfiles/file/774279704.pdfIn PDF document text
    • http://crosswaysrecruitment.com/userfiles/file/89174706180.pdfIn PDF document text
    • http://naasschoolofmotoring.com/fckeditor/userfiles/file/bibolijibasoj.pdfIn PDF document text
    • http://kahasat.cz/data/file/97257742843.pdfIn PDF document text
    • http://platypusspot.org/uploads/ckfinder/userfiles/files/sozemimogazovigobogo.pdfIn PDF document text
    • http://szerecsen.hu/editor_up/fomabofus.pdfIn PDF document text
    • http://healthywithhart.com/res/file/sifevepoxokasesexago.pdfIn PDF document text
    • http://kevinmcallisterlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/waziwutusa.pdfIn PDF document text
    • http://av72-reklama.ru/userfiles/file/163110185606b0cd2e50c352a8a8a4.pdfIn PDF document text
    • http://xn--72c7caerxx0d3a9eve.com/UserFiles/File/rewiwopita.pdfIn PDF document text
    • http://joyearland.com/ckfinder/userfiles/files/40460728959.pdfIn PDF document text
    • http://dtpokebar.com/uploads/files/mivurusonosomepaweliminoj.pdfIn PDF document text
    • https://reparationmobile.net/userfiles/file/metawiseta.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=galaxy+s2+android+7PDF 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_off0001000f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1000F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011826.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11826 10436 bytes
SHA-256: fcd965e73c5096e35aad70c2d7530f077cd0c2f3963f5a1b3686ea6e7b973546
font_02_sfnt_off00013005.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13005 17444 bytes
SHA-256: c3a1ee0dbdb0d93f025dac2189e0d73c693afcbe48b6ad245f7ea88b1a47a5ff

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