Malicious PDF — malware analysis report

Static analysis result for SHA-256 e529c680be00445b…

MALICIOUS

PDF

68.8 KB Created: 2021-09-29 14:16:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 03db755c3baf7f005c380581e7dd67e0 SHA-1: b3a3cc9cd8462e41210e8dd0aa5ea9318c897be8 SHA-256: e529c680be00445be4efe4142d42647c7f48b00217c3e22104cc6cd370b3a649
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, many of which point to disposable domains and are likely intended to redirect users to malicious content. The heuristic PDF_RANDOM_URL_LINK and PDF_SEO_DISPOSABLE_LINK_FARM strongly indicate a link farm or phishing attempt. ClamAV detection as Pdf.Phishing.Trojan further supports the malicious classification. No scripts were extracted, but the structure suggests a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not 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.
  • 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://www.thic.net/plugin/ce1/ckfinder/userfiles/files/lawazizuvujemu.pdf In PDF document text
    • http://55pluscommunityspecialist.com/userfiles/files/puxogabakaxoxuzagiz.pdfIn PDF document text
    • http://domplus.su/userfiles/files/7014711372.pdfIn PDF document text
    • http://birdwatching.sk/media/file/55821321485.pdfIn PDF document text
    • http://kstarsmall.net/userfiles/file///borilefisatev.pdfIn PDF document text
    • http://www.libroparlatolions.it/backoffice/ckfinder/userfiles/files/duzosiziwutuxonogakuwur.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/qihvl29bi17sre5l58ed13nsf0/nomogerosudefilol.pdfIn PDF document text
    • http://rewitex.pl/userfiles/file/67761237600.pdfIn PDF document text
    • http://jmk.kr/ckfinder/userfiles/files/74172649389.pdfIn PDF document text
    • https://www.auto-ecole-acm.com/ckfinder/userfiles/files/62037492505.pdfIn PDF document text
    • http://mikllc.mn/uploads/files/xitikulokonorunejij.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613ae968520db---63728758121.pdfIn PDF document text
    • https://radiosmile.hu/upload/file/29204893396.pdfIn PDF document text
    • http://cementfeet.com/userfiles/file/wepudiwomovo.pdfIn PDF document text
    • http://canvangdientu.com/images/file/66019886434.pdfIn PDF document text
    • http://unixsensor.com/uploads/files/202109011838378146.pdfIn PDF document text
    • https://jpt.mysmartedu.com/uploadimages/files/69870881384.pdfIn PDF document text
    • http://binhchuachay.info/Images_upload/files/pugapegojawerojedo.pdfIn PDF document text
    • http://www.web-globus.de/ckfinder/userfiles/files/35277214735.pdfIn PDF document text
    • http://ventilyatsia-v-sochi.ru/ckfinder/userfiles/files/10781521860.pdfIn PDF document text
    • http://demenagements-remond.fr/userfiles/file/20210920102529.pdfIn PDF document text
    • http://harasim.cz/uploaded/files/xinudofidufatovumoturi.pdfIn PDF document text
    • https://smartstone.ca/userfiles/files/25626729046.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=klondike+adventures+mod+apk+unlimited+gemsPDF 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_off0000add7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADD7 15116 bytes
SHA-256: a843eccf83ffc2cdeb70ffc6aca3cf29db694f24649357f7b4f37ab9cf3ad30a
font_01_sfnt_off0000d41d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD41D 10984 bytes
SHA-256: c4898328ad348c6fef234987ac2e867ad2c6c1ed29157a0a159da84323fc0cea
font_02_sfnt_off0000ed61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED61 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1