Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f7eaccab999564f…

MALICIOUS

PDF

81.1 KB Created: 2021-09-15 17:52:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 56ea974d22254305eacd06e674e053ab SHA-1: 8a76dbfb8c760bbe687713f621211e80d25bac5f SHA-256: 0f7eaccab999564f77183e2f69620205af77dbedff2207f45c33328ed3a3bf4f
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1539 Steal Application Data

The sample was detected by ClamAV as Pdf.Phishing.Trojan and exhibits characteristics of a credential harvesting lure, specifically targeting MFA or one-time codes. The PDF contains numerous embedded URLs, many of which point to potentially compromised websites hosting further malicious documents. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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://lafenicealcamo.it/userfiles/files/gapazubex.pdf In PDF document text
    • http://everestlodgelukla.com/userfiles/file/41474554604.pdfIn PDF document text
    • https://vyaspublicschool.com/ckfinder/userfiles/files/41292990558.pdfIn PDF document text
    • https://dimensioninteractive.com/WYSIWYGImage/file/90735563138.pdfIn PDF document text
    • http://indagosrl.it/userfiles/files/jisutoxubewowozekedizosen.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f3d6638680---neletemof.pdfIn PDF document text
    • http://esistore.com/userfiles/file/10759050205.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d029ecd21a---86741183780.pdfIn PDF document text
    • https://hinodecoder.com/userfiles/file/dugisowogepenegagera.pdfIn PDF document text
    • http://digifast.cz/userfiles/sewaxoparoj.pdfIn PDF document text
    • http://nasledie-sluck.by/var/upload/file/rixalaxagojosidixobotoj.pdfIn PDF document text
    • http://bjdfszwy.com/filespath/files/20210910002208.pdfIn PDF document text
    • http://muntepa.com/userfiles/files/vilapojakuze.pdfIn PDF document text
    • https://mamalight.net/business_school/uploads/file/bitegerasokoduk.pdfIn PDF document text
    • https://okinawa4d.com/contents/files/34884954215.pdfIn PDF document text
    • https://ans5680.preneed91.com/upload/files/tobuxobaju.pdfIn PDF document text
    • http://vdtonline.vn/static/uploads/editor/files/43805744046.pdfIn PDF document text
    • http://myagreement.com/UserFiles/file/82599890852.pdfIn PDF document text
    • http://kidneytracker.com/ckfinder/userfiles/files/noluvobinusavi.pdfIn PDF document text
    • http://medwin.kr/userData/board/file/40938878330.pdfIn PDF document text
    • http://younewstoday.com/task/userimages/file/74939364821.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=android+market+vs+applePDF 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_off0000d952.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD952 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f164.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF164 17708 bytes
SHA-256: 61c1f0f2edd2895806c83d923e21bf31c1a7494301e880715ee33e9adf8dfcac
font_02_sfnt_off00011ec0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EC0 10692 bytes
SHA-256: 8c33bdd0dffc83f598e8f393e140e0346acf87fcec22b8df3077e5a0465e4da1

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