Malicious PDF — malware analysis report

Static analysis result for SHA-256 6878edff571212e9…

MALICIOUS

PDF

83.2 KB Created: 2021-09-16 21:00:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1d80e4451b135db93c170d2d348d0dc0 SHA-1: 05b3927f8e52fd2d6c004dc1ef69d3f63fba2162 SHA-256: 6878edff571212e94e4e2bf48db477a54a73e9764b01771a4432edaa15b47a35
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs that point to a link farm hosted on disposable domains, suggesting an attempt to redirect users to malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a deliberate structure for distributing links. No scripts were extracted, but the overall structure and URL distribution strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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://synerhu.ru/uplcv?utm_term=my+phone+explorer+apk PDF link annotation
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/5e91e9057ce4617a77227f72f56f22bc/90199783053.pdfIn PDF document text
    • http://falcon.dk/sites/default/files/webfm/79655594567.pdfIn PDF document text
    • http://imhyuk.com/imhyukeditor/userfile/file/12401198226.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/20621219353.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614191417fa86---97439358691.pdfIn PDF document text
    • http://kovacsoltvaskerites.hu/images/file/37878327140.pdfIn PDF document text
    • https://3rproject.eu/ckfinder/userfiles/files/2105351178.pdfIn PDF document text
    • http://polyacer-ecp.com/userfiles/files/20210903_130031.pdfIn PDF document text
    • https://dehayemek.net/upload/ckfinder/files/dowoponunem.pdfIn PDF document text
    • https://x-leather.com/radsportfiles/file/33770104298.pdfIn PDF document text
    • http://qdxqw.com/uploadfile/file/kosukivofazinu.pdfIn PDF document text
    • http://megatex-plast.ru/pub/file/8675719384.pdfIn PDF document text
    • https://ce-mi.pl/uploads/userfiles/files/92355004195.pdfIn PDF document text
    • http://polyacer-ecp.com/userfiles/files/20210905_085608.pdfIn PDF document text
    • https://habibitoursegypt.com/ckfinder/userfiles/files/voduzimiv.pdfIn PDF document text
    • https://morganmethod.tuesdaytrader.com/ci/userfiles/files/fuwejufeburuz.pdfIn PDF document text
    • http://brandorbit.in/userfiles/file/fumodowadirek.pdfIn PDF document text
    • http://rheinmotel.com/userfiles/file/4538045498.pdfIn PDF document text
    • https://techielingo.com/fck_uploads/files/tusobaxave.pdfIn PDF document text
    • http://canvangdientu.com/images/file/sepeliwara.pdfIn PDF document text
    • http://sziszolg.hu/editor_up/xipekaremogadezixuwele.pdfIn PDF document text
    • https://biorenta.lt/ckfinder/userfiles/files/rudirowofogusenuzi.pdfIn PDF document text
    • http://kaupa.cz/userfiles/file/pogoxabuw.pdfIn PDF document text
    • http://gsxr.hu/userfiles/file/figipisezimow.pdfIn PDF document text
    • https://hearing-outlet.com/uploads/files/202109160459206714.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c1d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d9e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9E9 16248 bytes
SHA-256: 1658917a9eee2fba5736f067a1eeb97e8ec74e50e50ceedb68bc535c07c2439b
font_02_sfnt_off0000eff7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF7 10292 bytes
SHA-256: a5146b9789166305b661b181fd49017c237dbb1cfd882ad6a3f0dfd3510852d2
font_03_sfnt_off00010712.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10712 21884 bytes
SHA-256: 4136a45998c05b1e6ecbf78011207a3c71248bd729b4c4c2e44cfb433c19ef04