Malicious PDF — malware analysis report

Static analysis result for SHA-256 31a10b0076ccd142…

MALICIOUS

PDF

75.1 KB Created: 2021-09-18 11:53:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 79abe6268a88837f7af336fc758b02d0 SHA-1: 9f5f27aec9e56fe79cbb85f64760db57bee1ea8f SHA-256: 31a10b0076ccd1427836a96708d9e29d9fe809c8e132858d284b0d7d3ad60bfd
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with one specifically identified as a malicious redirector. The document body uses a lure related to disappearing text messages to entice users to click these links. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://infrive.ru/uplcv?utm_term=why+did+all+my+text+messages+disappear+android In PDF document text
    • http://kondicionery-fryazino.ru/upload_picture/file/21176989928.pdfIn PDF document text
    • http://www.dawnrotaryclub.tw/UserFiles/files/17810826139.pdfIn PDF document text
    • https://okazionche.com/files/bujaroxonopuni.pdfIn PDF document text
    • http://baikalspring.ru/ckfinder/userfiles/files/fopexategaju.pdfIn PDF document text
    • https://bawauang.com/contents/files/winemoxiridopagim.pdfIn PDF document text
    • http://pi-consulting.ch/download/98703058937.pdfIn PDF document text
    • http://aylabawadi.ae/userfiles/file/2082054850.pdfIn PDF document text
    • http://dlastudenta.org/Upload/file/fiwukomovaz.pdfIn PDF document text
    • https://mamotato.ro/userfiles/file/medononu.pdfIn PDF document text
    • http://location-venise.com/italie_documents/files/83980206913.pdfIn PDF document text
    • http://kursverwaltung.fit-n-essen.ch/ckfinder/userfiles/files/kixowaxokoxa.pdfIn PDF document text
    • https://www.colegiodomus.com.br/js/ckfinder/userfiles/files/8590871744.pdfIn PDF document text
    • https://frigosztufi.ro/ckfinder/userfiles/files/52808215316.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/73a3ff35a8e038d6466b9b7f79880d95/72197466971.pdfIn PDF document text
    • https://yunglin.com/uploadpic/files/70983513380.pdfIn PDF document text
    • https://bamfieldrental.com/userfiles/file/jaxute.pdfIn PDF document text
    • http://konferencii.org/js/ckfinder/userfiles/files/58397221776.pdfIn PDF document text
    • http://akademibt.com/resimler/files/fisobul.pdfIn PDF document text
    • http://psystems.gr/Administrator/uploads/userpics/OutPostImages/files/66725051723.pdfIn PDF document text
    • http://iviltra.lt/images/files/pavitol.pdfIn PDF document text
    • https://stancijanegrin.com/UserFiles/files/49789072903.pdfIn PDF document text
    • http://www.lukoilmarine.com/ckfinder/userfiles/files/jawinasezokimofemoweluwoj.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 extracted file (font_00_sfnt_off0000bee9.bin)
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn extracted file (font_00_sfnt_off0000bee9.bin)

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bee9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEE9 11048 bytes
SHA-256: 86a4ce75aed5224bbd339359b6f4975f52af08f378587375b1db18ba0c033439
font_01_sfnt_off0000d838.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD838 18780 bytes
SHA-256: f7f888eb032728cec35bf9d90c752acf7076ab0ab740cacae61fc77766e42844
font_02_sfnt_off000106e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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