Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d5fb77b75554241…

MALICIOUS

PDF

83.9 KB Created: 2021-09-19 06:45:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a98f30d129e5929cb5c631fba980d7c6 SHA-1: b57ebbdd307896462203ff0a693efc1ac8f0d6a2 SHA-256: 7d5fb77b75554241fd3cf26619bf26e5e201eb20e189c6c59009c0cc9d2827ff
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The 'Password-protected archive handoff' heuristic suggests the document's purpose is to trick users into downloading an encrypted payload, likely to evade security scanning. The embedded URLs and link farm heuristic further support a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://archism.ru/uplcv?utm_term=how+to+open+a+cbr+file+on+android PDF link annotation
    • http://arredamentoambienti.it/img/file/nuvirakosodasibidewew.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/16137349b4a13b---94391580571.pdfIn PDF document text
    • http://swhos.com/upload/files/rezozopeguza.pdfIn PDF document text
    • http://cycling-software.com/files/file/sisomalapududezef.pdfIn PDF document text
    • http://akiisushi.com/uploads/files/tidapowijijaxelojuxa.pdfIn PDF document text
    • http://tienphat.vn/imagesflashupload/file/mevizifazu.pdfIn PDF document text
    • http://solarissoft.com/img/userfiles/files/62819948577.pdfIn PDF document text
    • http://www.gpkoaee.ru/ckfinder/userfiles/files/patoroluwepaf.pdfIn PDF document text
    • https://siangyun.com/upfiles/editor/files/ponomuzafasifeda.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138970856688---23064066497.pdfIn PDF document text
    • http://kosmonautika.ee/ckfinder/userfiles/files/8217119126.pdfIn PDF document text
    • http://ajeah-intl.org/fck_image/file/90922436806.pdfIn PDF document text
    • https://kompaspt2.com/contents/files/wujeb.pdfIn PDF document text
    • http://mbfeed.vn/upload/files/zelerojutazumipo.pdfIn PDF document text
    • http://onlytech-tunisie.com/userfiles/file/39812920831.pdfIn PDF document text
    • http://centreforeffectivecoaching.com/media/file/dejuvetumu.pdfIn PDF document text
    • http://chiangmai-esc.net/user_img/files/zuliwumovunewotilunux.pdfIn PDF document text
    • https://rajaunited.com/contents/files/keluxerofobegudobunaxogof.pdfIn PDF document text
    • https://jmcoverseaspvtltd.com/uploads/files/32350980040.pdfIn PDF document text
    • https://okna-kursk.ru/page_edit/_samples/userfiles/files/41721631871.pdfIn PDF document text
    • http://scouttautomotive.com/editor_uploads/system/files/xabireba.pdfIn PDF document text
    • http://dailitara.lt/bites/uploads/file/vizepikaxog.pdfIn PDF document text
    • http://sellmysayarah.com/userfiles/files/69964346668.pdfIn PDF document text
    • https://winpoasia.com/ckfinder/userfiles/files/12780944565.pdfIn PDF document text
    • http://akademibt.com/resimler/files/xunosexasufivuvunoji.pdfIn PDF document text
    • http://wccflooring.com/userfiles/files/roxezukisoketegiwe.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_off0000e53b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE53B 10660 bytes
SHA-256: 7ee1ad1ce5df23c4bb4bc12028e34e7a1b6665a6465fd63e16a112b5d937f1dc
font_01_sfnt_off0000fd8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD8A 16996 bytes
SHA-256: 342f5739164aa05b5d98ffbedff6eabc197bb1f5db1a3e93ce9fea3f42dc2a12
font_02_sfnt_off00012986.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12986 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1