Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b3f1603616d082b…

MALICIOUS

PDF

116.1 KB Created: 2021-10-20 19:06:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: c48134a71dfa5bb305aa0b30ad87d46a SHA-1: 2f26e94bf15af92bf21df4125910a2b9486acf8b SHA-256: 9b3f1603616d082b1b36c4d6b9051be0d8254f02ad9dfef3e29918de0f5c0c32
146 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by ML classifiers and ClamAV as malicious phishing content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high volume of links on low-reputation hosting, suggesting an attempt to distribute malicious content or phish users. The presence of external URIs and the overall structure strongly suggest a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://drafthe.ru/uplcv?utm_term=yearning+to+learn PDF link annotation
    • http://gernano.eu/gfx/userfiles/files/xajizun.pdfIn PDF document text
    • http://worthingtonpark101.com/userimages/riwuzud.pdfIn PDF document text
    • http://seghers.kr/data/editor/file/1734532206167978c7d228.pdfIn PDF document text
    • http://bdnchem.com/upload/files/sonulofom.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615e61d838380---temilalabutezifit.pdfIn PDF document text
    • https://slotpt2.com/contents/files/jitisulalomevovafapize.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1615ecd1ed58a2---99005678510.pdfIn PDF document text
    • https://szelvedojavitasmiskolc.hu/files/files/robipivi.pdfIn PDF document text
    • http://younewstoday.com/task/userimages/file/48595641020.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/kojikinekisoxut.pdfIn PDF document text
    • http://brlairport.com/images/file/10921448553.pdfIn PDF document text
    • http://nomayaku.com/userfiles/file/15663133570.pdfIn PDF document text
    • http://csc025.com/userfiles/file/20211020023118_t3xhb2.pdfIn PDF document text
    • https://infypos.com/infyposcms/media/27162426007.pdfIn PDF document text
    • http://chargooshads.com/images/upload/files/70685628433.pdfIn PDF document text
    • http://cochemical.com/upload/files/95387976826.pdfIn PDF document text
    • https://kuepancong.com/contents/files/japud.pdfIn PDF document text
    • http://nuovartea.eu/userfiles/files/12244596444.pdfIn PDF document text
    • http://tetrafluoro.com/upload/files/gebobowakesas.pdfIn PDF document text
    • http://jiji.pgo.tw/pic/uploads/files/30262466617.pdfIn PDF document text
    • https://walterchiropracticclinic.com/home/walter/public_html/ckfinder/userfiles/files/rumated.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000160ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x160AD 19628 bytes
SHA-256: 23f116a45a0104e1029e4947102472c9bdc12ce67be4e42ab5f5933185233f25
font_01_sfnt_off00019456.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19456 10100 bytes
SHA-256: e9041844bbd38dd43fc3f7fbcfcef8a14a3812c120091825b82e1292135916a5
font_02_sfnt_off0001aaf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AAF0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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