Malicious PDF — malware analysis report

Static analysis result for SHA-256 b28ecde3ade7b658…

MALICIOUS

PDF

79.8 KB Created: 2021-09-13 05:21:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ea786da44a980455b96f3adc2daab551 SHA-1: 12804b6db6147e49d879599d6e5a3984b76e85d2 SHA-256: b28ecde3ade7b6581bdff83e84a85483b3756bd7eadb4c4ee9b4bc314e3076c9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as a malicious PDF by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs, suggesting it functions as a link farm or redirection mechanism to potentially malicious sites. The PDF's structure and embedded links point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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
  • 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://curtain.jinware.com/upload/files/tulujepamikumiluxuregul.pdf In PDF document text
    • http://gro-felix.si/uploads/fevusojuzejowipijof.pdfIn PDF document text
    • http://baltic-rt.ru/ckfinder/userfiles/files/21048165079.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16135ea546561a---suleguparevuragowo.pdfIn PDF document text
    • http://ez-surveying.com/htdocs/cljr/data/files/bomatusamub.pdfIn PDF document text
    • https://www.afoa.org.ar/backend/ckfinder/userfiles/files/tasadowimuzugexelobag.pdfIn PDF document text
    • http://fipjp.com/userfiles/file/53632313504.pdfIn PDF document text
    • https://nepaltrekkinginhimalaya.com/assets/userfiles/files/ramegeduwawizisanexo.pdfIn PDF document text
    • http://gesundezellen.de/neu/userfiles/file/31503429088.pdfIn PDF document text
    • http://rm-centr.ru/uploads/file/68381281755.pdfIn PDF document text
    • http://domoticasociale.it/immaginiNewsletter/file/12458632383.pdfIn PDF document text
    • https://samirkumarpaul.com/ckfinder/userfiles/files/tigemibifuzak.pdfIn PDF document text
    • http://www.skk.com.hk/admin/ckfinder/userfiles/files/mofolajikexizo.pdfIn PDF document text
    • https://foursservices.com/nbloom/fckuploads/file/ruxuvogogutigizerizabek.pdfIn PDF document text
    • http://duquenne-moteurs.fr/webroot/upload/files/94697717963.pdfIn PDF document text
    • https://businesslife.com/content/file/6592214480.pdfIn PDF document text
    • http://studioguagnoni.it/userfiles/files/fevekozogutobug.pdfIn PDF document text
    • http://brucemayrockinstitute.com/assets/ckfinder/core/connector/php/uploads/files/gavolonusewepivibev.pdfIn PDF document text
    • https://fpcofmacon.com/nbloom/fckuploads/file/fulupujavanupezusewili.pdfIn PDF document text
    • http://rayocazar.com/images/elfinder-1.1/files/file/mewuwiwedasajexom.pdfIn PDF document text
    • http://aokunoil.com/ckfinder/userfiles/files/39772097208.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/37860300265.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=free+camscanner+joker+malwarePDF 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_off0000d435.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD435 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC47 17208 bytes
SHA-256: 85488be544006784964796e6bf12b065c863ee63895c5ee51cff638590636436
font_02_sfnt_off00011994.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11994 10484 bytes
SHA-256: be865d871dccc253986d25d1e1e7ee9e53d25dedce889dd80b157eb015c3933c

Open this report in the interactive analyzer, or submit your own file for analysis.