Malicious PDF — malware analysis report

Static analysis result for SHA-256 74e2813b03f35ea7…

MALICIOUS

PDF

82.3 KB Created: 2021-09-09 00:54:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: acaf4d6f747855c5e19da8e3fb9cc67e SHA-1: 458d3c25ae54ef3309c45811230db5886b8693c2 SHA-256: 74e2813b03f35ea75fb38db5c1e912a3ff0a82e8eb74ef862f25868a4acfb4ad
154 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple external URIs, including one pointing to a raw IP address, indicating an attempt to redirect the user to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests the document's purpose is to host a large number of links on disposable domains, likely for phishing or malware distribution. ClamAV detection and ML classification confirm its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://philabc.ru/uplcv?utm_term=how+to+update+mi+tv+apps PDF link annotation
    • https://12tiga.com/contents/files/90345429510.pdfIn PDF document text
    • https://areopag.ru/sites/default/files/uploads/firuniwelusema.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/161361e44c4372---kadirikagulewipasusado.pdfIn PDF document text
    • http://j1ent.com/userfiles/file/20210909065146.pdfIn PDF document text
    • http://ancient-theater.gr/media/file/30479794653.pdfIn PDF document text
    • https://marathonroller.com/userfiles/files/31572874759.pdfIn PDF document text
    • http://unewstoday.com/task/userimages/file/25197300468.pdfIn PDF document text
    • http://emotionpicturesfestival.gr/userfiles/file/59865757724.pdfIn PDF document text
    • http://dc-a0dcf319a153.breakthroughsport.com/userfiles/files/52755462424.pdfIn PDF document text
    • http://bobas24.pl/Upload/file/womadapizotojukudowot.pdfIn PDF document text
    • http://zekejozsef.eu/FCKfeltoltott/file/fiduteledalufoguganisawex.pdfIn PDF document text
    • https://itscebu.com/upload/file/20210909033401.pdfIn PDF document text
    • http://tjjjsh.com/uploads/files/83169777970.pdfIn PDF document text
    • https://abyway.lv/images/ck_images/files/62122759157.pdfIn PDF document text
    • http://www.parinet.fi/tiedostot/files/vupatirodunigexi.pdfIn PDF document text
    • http://oodow.cn/upload/file/210904062105705929ep9rxcbb6kbk.pdfIn PDF document text
    • http://ameshamagazine.com/js/upload/files/boxedejijidolema.pdfIn PDF document text
    • http://dae-young.kr/upload/fckeditor/file/xobibejimotasomulotuv.pdfIn PDF document text
    • http://stadtbild-intervention.de/Quansis/ckfinder/userfiles/files/22945816992.pdfIn PDF document text
    • http://185.33.116.145/~acus01/upload/files/rutisutiwema.pdfPDF link annotation
    • https://www.la-providence-ehpad.fr/ckfinder/userfiles/files/42664859574.pdfIn PDF document text
    • http://civicwomen.com/ckfiles/files/zonoposeb.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/161387b2a108a4---81250474309.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_off0000d88c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD88C 10544 bytes
SHA-256: d49cc0a6bbd5949c7a001d0328e8306fd3aa0938a9b9b1277052cb4bb31a53dd
font_01_sfnt_off0000f0a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0A3 19808 bytes
SHA-256: a0fdf753b6231a53fa059f418fa58fc3788b2855dea415384ab229c22599f8a4
font_02_sfnt_off000123d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1