Malicious PDF — malware analysis report

Static analysis result for SHA-256 70dacb746141d9a9…

MALICIOUS

PDF

69.3 KB Created: 2021-09-19 10:12:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 30dc096de2caa6a70e9e6de35555c0c8 SHA-1: b5a6523ad48d8ec77e798e4c06c1e0a6deecc1bd SHA-256: 70dacb746141d9a94d3cb217afd6e3ac832487850e6a995b526181abb5f3fe3d
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external URLs, including one using a raw IP address. The document body is heavily obfuscated and unreadable, suggesting it is designed to obscure its malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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
  • 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.
  • 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://taipeitccia.org/CKEdit/upload/files/40337518667.pdf In PDF document text
    • http://marymo.ru/uploads/files/60593912779.pdfIn PDF document text
    • http://accapierre.it/userfiles/files/12716402496.pdfIn PDF document text
    • https://synodradomski.pl/userfiles/file/64771747832.pdfIn PDF document text
    • http://140.121.125.49/ckfinder/userfiles/files/20210919_143004.pdfPDF link annotation
    • http://pwmtqatar.net/userfiles/file/zemepawumuxusukamorupuze.pdfIn PDF document text
    • http://archiw.gbpopatowiec.pl/img/upload/files/bewevatesebasixura.pdfIn PDF document text
    • http://hoanggiaphatland.com/uploads/image/files/zatakatixivabiraxigizud.pdfIn PDF document text
    • https://pezenasenchantee.fr/userfiles/file/3095842122.pdfIn PDF document text
    • http://turhantur.com/turhantur/files/pakugadubaxagaper.pdfIn PDF document text
    • http://vivatbacchus.hu/files/file/fuxirutuxume.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16140872b68653---kojugaxesazudexadinura.pdfIn PDF document text
    • http://truhlarstvi-strakonice.cz/files/file/bokezogamabuwiralug.pdfIn PDF document text
    • http://conhantaoankhanh.com/webroot/img/files/sugarali.pdfIn PDF document text
    • http://nuk-amro.de/userfiles/file/fuzinal.pdfIn PDF document text
    • https://totalsewa.com/userfiles/file/28957328266.pdfIn PDF document text
    • https://implant-drill.com/userfiles/file/90013949590.pdfIn PDF document text
    • http://estatepie.com/files/userfiles/file/kusoga.pdfIn PDF document text
    • http://panova-art.com/files/file/fatemosad.pdfIn PDF document text
    • https://bancodevida.com/bancodevida/admin/images/image/file/13902682220.pdfIn PDF document text
    • http://worldprint.su/userfiles/file/baleziporenuzagas.pdfIn PDF document text
    • https://glozor.com/userfiles/file/fojewavejo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=navigation+bar+app+androidPDF 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_off0000b3d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3D8 10404 bytes
SHA-256: 85dacb9356fbd190d87bdef261db9cb2820ea8f51c098ba331c85fb6bf401299
font_01_sfnt_off0000cb15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB15 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e327.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE327 14760 bytes
SHA-256: 1eb5d3596f0fae37f32125038c0332c4bb05cba8dc0e31994b4d729fedacc560

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