Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4c4c80809a95279…

MALICIOUS

PDF

82.6 KB Created: 2021-09-14 11:46:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 2dc5c8bd9985d93f178e30e38549b84a SHA-1: 1e38655a377bdea59b98a992b262bd042eea0031 SHA-256: c4c4c80809a952795b7bdb4c2e8ba0f260f5949b1dd5ef7feb0390ccc19fff01
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple external links, with one heuristic specifically identifying a link to an algorithmically-generated URL on potentially disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://kidsjeodo.com/images/files/gafopefumidoxibereputo.pdf In PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff5c35b257---mefiwodesizidipavatuna.pdfIn PDF document text
    • https://nieruchomosciturystyczne.eu/files/file/gefuxisolokewilejubegura.pdfIn PDF document text
    • https://presentkompaniet.com/img/content/file/187739756.pdfIn PDF document text
    • http://iraneto.com/basefile/iranetocom/files/kurelusuwudovodazigotix.pdfIn PDF document text
    • http://www.naraihillgolf.com/admin/userfiles/file/novobigemetiriratif.pdfIn PDF document text
    • http://hkxhjfc.ltd/uploads/files/20210909100646.pdfIn PDF document text
    • https://mintedimages.com/ckfinder/userfiles/files/womijiratu.pdfIn PDF document text
    • http://bkmarine.net/ckfinder/userfiles/files/1631177744.pdfIn PDF document text
    • https://www.hotel-restaurant-plainfaing.fr/ckfinder/userfiles/files/36262199974.pdfIn PDF document text
    • https://cantellodetersiviprofessionali.it/uploads/file/21215516779.pdfIn PDF document text
    • https://www.aukuras.org/ckfinder/userfiles/files/2909533167.pdfIn PDF document text
    • https://epgeptech.hu/ckfinder/userfiles/files/gekifokevaxeretawigulid.pdfIn PDF document text
    • http://pneusmarene.it/images/file/lumosesep.pdfIn PDF document text
    • http://micruts.org/userfiles/file/somiseximutubilejera.pdfIn PDF document text
    • https://stomatoloska-ordinacija-rijeka.com/files/91959818441.pdfIn PDF document text
    • https://www.la-providence-ehpad.fr/ckfinder/userfiles/files/solizuxarokuruwemirokam.pdfIn PDF document text
    • https://warungmimpishio.com/contents/files/kifokebonuz.pdfIn PDF document text
    • http://iphysiology.ru/upload/38894610945.pdfIn PDF document text
    • https://heatingboiler.ca/fck_upload/file/lapodomuzuretimo.pdfIn PDF document text
    • https://gfwofficial.com/ck_imgs/files/39024927841.pdfIn PDF document text
    • http://mgocsm.in/userfiles/file/gumipawawujebijaw.pdfIn PDF document text
    • https://bharatiyabhashaparishad.org/ckfinder/userfiles/files/52041557905.pdfIn PDF document text
    • http://footstepfloor.com/upfiles/files/zupivute.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=android+emulator+for+windows+7+low+end+pcPDF 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_off0000dcfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCFE 17900 bytes
SHA-256: 30668aa326b2045c731acc806b6ef83b18e2f31d736d9983cd8d18431695feaa
font_01_sfnt_off00010adf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ADF 11000 bytes
SHA-256: 2bae9f470adbfc1d9cd304d3924302d7176a0fcb117e7901dcfb472176ee8e06
font_02_sfnt_off00012490.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12490 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1