Malicious PDF — malware analysis report

Static analysis result for SHA-256 886926641ec29361…

MALICIOUS

PDF

68.6 KB Created: 2021-09-27 22:22:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 96bbe18684039bf7ba8a819c64be7bdb SHA-1: 71c221aa4c84b67124a0077027e756e9d3bd1ef6 SHA-256: 886926641ec29361c33ecc94b106ab4da41911ef49834070f1f4e8bf8e0a6bf7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded URLs, many pointing to disposable domains, indicating a link farm designed to distribute traffic. ClamAV and an ML classifier flagged this PDF as malicious, specifically as a phishing trojan. The presence of numerous links and the classification suggest the primary purpose is to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/161412fa93112c---xulusiwumazaw.pdf In PDF document text
    • http://lamelove-zakryti.cz/userfiles/file/javakadusiputod.pdfIn PDF document text
    • http://www.sindafaz.com.br/admin/editor/ckfinder/userfiles/files/9406787515.pdfIn PDF document text
    • http://kustari.net/userfiles/file/dubejobe.pdfIn PDF document text
    • http://classicalgardenornaments.com/uplds/file/55946680574.pdfIn PDF document text
    • http://fuhua.tumujike.com/assets/upload/files/202109070912481502.pdfIn PDF document text
    • http://dlabiura.kbo.pl/ckfinder/userfiles/files/rukofizepogiwavijepel.pdfIn PDF document text
    • http://wagnerpc.com/userfiles/files/23907457130.pdfIn PDF document text
    • https://infosantiere.ro/userfiles/file/27240402813.pdfIn PDF document text
    • http://celesteandtorsten.wedding/images/file/molosizasajoraz.pdfIn PDF document text
    • https://on-call-anatomist.org/ckfinder/userfiles/files/72021751122.pdfIn PDF document text
    • http://ferramentabelleggia.it/public/file/golukaginikopikuvib.pdfIn PDF document text
    • http://a2kat.ru/userfiles/file/binete.pdfIn PDF document text
    • http://www.ezmoving.com/file/damufukuxavofavinikonuje.pdfIn PDF document text
    • https://pasifikendustriyel.com/userfiles/file/50494416090.pdfIn PDF document text
    • http://xatrbio.com/userfiles/file/ratavalerepuriletef.pdfIn PDF document text
    • https://artistprasanna.com/userfiles/file/14047709877.pdfIn PDF document text
    • https://delaneyllc.com/ckfinder/userfiles/files/35381848019.pdfIn PDF document text
    • http://canadanur.com/resimler/files/wakiduligiwuje.pdfIn PDF document text
    • http://fruitvita.com/files/files/wusimut.pdfIn PDF document text
    • https://bi-kiesabbau.de/cmsimple/images/file/10858122385.pdfIn PDF document text
    • https://nasikampung.info/contents/files/42731525022.pdfIn PDF document text
    • https://jgranit.pl/userfiles/file/bakimumikepinemobesokekum.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=pokemon+go+laptop+spoofPDF 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_off0000ad8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD8B 15592 bytes
SHA-256: 51503361511d8153ce3b93017291be25e648f699dc3448d7548b55b0269b6efe
font_01_sfnt_off0000d4f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ed0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED0E 10600 bytes
SHA-256: c1f750c64703990efece530b4607fee66fb07b43aa67bb2f0709a4cb3e2f07cd