Malicious PDF — malware analysis report

Static analysis result for SHA-256 403b16d044dce5ac…

MALICIOUS

PDF

68.5 KB Created: 2021-10-01 04:06:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 229669d3f3314204c4e5efab1c45e5aa SHA-1: 2861ea6564a4e413cbb7eb80c4c0c6af759e4953 SHA-256: 403b16d044dce5ac2c1f8d8b716367ebcc57ff6a98eea174de9ecbd0388da952
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. The PDF_IMAGE_LURE heuristic indicates it's an image-based document designed to trick users into clicking an embedded URI, which is a common tactic for spearphishing attachments. The numerous embedded URLs, many pointing to disposable domains, further support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://tennis94.fr/img/pics/files/sirugexebomu.pdf In PDF document text
    • http://soc-in.com/data/media/files/6330032395.pdfIn PDF document text
    • http://szjglaw.com/uploadfile/file/2021092917431273499.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/kozenumovasuwuzor.pdfIn PDF document text
    • https://retta-bg.com/userfiles/58371903936.pdfIn PDF document text
    • http://mtsp.by/userfiles/files/mevamuzifapiminug.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1613c9a0597e58---ribamavunumewovosarebilad.pdfIn PDF document text
    • http://ever0036.com/assets/uploads/ckedit/files/20210907192436.pdfIn PDF document text
    • http://myphamlulanjina.com/upload/files/58817712173.pdfIn PDF document text
    • http://toyotarent.kr/FileData/ckfinder/files/20210924_2C5C45AE3CE9F8F4.pdfIn PDF document text
    • https://lmbri.com/WYSIWYGImage/file/50629193602.pdfIn PDF document text
    • http://ecole-belair.com/ecole/file/jerekepuxuvan.pdfIn PDF document text
    • https://maychieuvinh.vn/upload/files/jodinojavexaxa.pdfIn PDF document text
    • http://twfbs.com/ckfinder/userfiles/files/15783775387.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/398abe0e60319649bc40be465271c158/96670927947.pdfIn PDF document text
    • http://aryajob.com/user_upload/file/76032480387.pdfIn PDF document text
    • http://www.frank-diagn.hu/userfiles/files/28152399582.pdfIn PDF document text
    • http://ozkayalarlojistik.com/userfiles/file/63567879691.pdfIn PDF document text
    • https://2ruoteexpo.it/ckfinder/userfiles/files/fewozikejogufevogofulivuw.pdfIn PDF document text
    • http://heizler.hu/files/file/11707824421.pdfIn PDF document text
    • http://wjcopy.com/upload/files/83984133913.pdfIn PDF document text
    • http://strategie-online.net/catalogue_dynamique/file/43039819259.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/161492f271fd72---rofoziwezesilazar.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/38180792495.pdfIn PDF document text
    • https://apsco.ly/userfiles/files/42884518066.pdfIn PDF document text
    • https://cicimanis.com/contents/files/zekexaposovadujogukigosar.pdfIn PDF document text
    • https://cam-ceeds.org/ckfinder/userfiles/files/84745634986.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=pc+legends+bang+bangPDF 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_off0000b234.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB234 14236 bytes
SHA-256: 52e0c28266fe6052a6860470ce1369f9bc378d228c39dfa684ecc76d9af836a9
font_01_sfnt_off0000d57b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD57B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ed92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED92 10276 bytes
SHA-256: b1e9622feed90d98477aaa0de7fbaf617e1483ca40e8400274ae30de2f815a28