Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb198a5571898693…

MALICIOUS

PDF

142.8 KB Created: 2021-02-02 18:12:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 85a22c88e586cd109b0bd73e5772a62c SHA-1: b353af4dc145f8115384b63b920d14f22039f3f4 SHA-256: cb198a5571898693c815767ab5d4cd3749ace63734b83e89538b9475c54b730b
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 0.9989

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://bologen.ru/aws?utm_term=the+pilgrim%2527+s+progress+john+bunyan+pdf PDF link annotation
    • http://waniwidolo.66ghz.com/41815961479.pdfIn PDF document text
    • http://help-violation.com/construction_robot_factorioyimd0.pdfIn PDF document text
    • http://rfs.team/1290021943lqwoy.pdfIn PDF document text
    • https://sozejaras.weebly.com/uploads/1/3/2/6/132695734/0d6b8f8dd8a8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447089/normal_5fd1008263aab.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379379/normal_5fe0232ddaf90.pdfIn PDF document text
    • http://slampochka.ru/medicina_transfusional_radillodqdhk.pdfIn PDF document text
    • http://vofovadero.22web.org/annals_of_botany_guidelines_for_authors.pdfIn PDF document text
    • https://nodokesomizi.weebly.com/uploads/1/3/4/6/134656280/zedividenar.pdfIn PDF document text
    • http://zipotuja.iblogger.org/shatta_wale_songs_2014.pdfIn PDF document text
    • https://batuputuj.weebly.com/uploads/1/3/0/7/130739628/mafenonituliku_nefavatej.pdfIn PDF document text
    • https://nogusuxewi.weebly.com/uploads/1/3/1/4/131438155/nolakipe_makereril.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kodeketabekem.epizy.com/captain_america_civil_war_songs.pdfIn PDF document text
    • http://gelifadewew.rf.gd/vegopipokuteletufitason.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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001c63f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C63F 6220 bytes
SHA-256: f585d5c916efc6dbe61b44f857ba4755323dac36bbc1de2a5083ffd1beb7b1d3
font_01_sfnt_off0001dbcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DBCC 5756 bytes
SHA-256: 50b00b4ac54bdf8c47603de79953940e9135bdb91dffaf3a4806cdfa86cfadff
font_02_sfnt_off0001ef48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EF48 12576 bytes
SHA-256: 8823f0785da29a385566d68bfc232f24a0b1d6462fa8bdd2790422f536ab4fe6
font_03_sfnt_off00021777.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21777 16204 bytes
SHA-256: e93acd332f5893643511f4cefd38969ad5c744ad1b08842a788b6be7d277dd15