Malicious PDF — malware analysis report

Static analysis result for SHA-256 5490cab3f4690c3b…

MALICIOUS

PDF

92.8 KB Created: 2021-09-11 14:46:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 49278d110e1b395695f11fba755348b2 SHA-1: cf75752b15dfdcc9729904a5bcccee7a32f3f71d SHA-256: 5490cab3f4690c3b19ac90b4d8b294a668d073c9f544032be3d78cd999c97ab1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan variant. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document's purpose is to host numerous links on disposable domains, a common tactic for phishing or distributing further malware. While no scripts were extracted, the document structure and URL patterns suggest it's designed to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://gpshardorawal.com/hemkunt/userfiles/file/8899999320.pdf In PDF document text
    • http://sasolution.kr/userfiles/file/lewijawuwezexaralonokame.pdfIn PDF document text
    • http://debten.net/UserFiles/File/badobip.pdfIn PDF document text
    • http://archi1919.com/smlclub-files/file/95837383578.pdfIn PDF document text
    • https://prestinieurope.com/userfiles/files/20336785112.pdfIn PDF document text
    • https://irantruck.ir/data/file/28324449023.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16139211574afe---wotodepomejezexugebuledaf.pdfIn PDF document text
    • https://reviewz.eu/app/webroot/files/userfiles/files/luvezarofipififoj.pdfIn PDF document text
    • http://binhchuachay.info/Images_upload/files/21793701542.pdfIn PDF document text
    • http://birizgardenhotel.com/userfiles/file/78672511993.pdfIn PDF document text
    • http://coming-c.com/userfiles/file/57393474721.pdfIn PDF document text
    • http://sculecuacumulator.ro/app/webroot/files/userfiles/files/11001358981.pdfIn PDF document text
    • http://rockbond-aac.com/id-admin/fckImages/file/74734603746.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161318cd7518fb---5405157883.pdfIn PDF document text
    • http://www.nachtruhe.info/up/files/nivozoxekovadosaxa.pdfIn PDF document text
    • http://an-ocn.ru/ckfinder/userfiles/files/90709776206.pdfIn PDF document text
    • https://www.whoamiandwhyamihere.com/ckfinder/userfiles/files/63435610013.pdfIn PDF document text
    • http://pc-driver.ru/userfiles/files/67469915263.pdfIn PDF document text
    • https://plewmal-d.com/Uploads/files/tiwuxaxumodadixu.pdfIn PDF document text
    • http://change4best.ru/upload/file/71109338421.pdfIn PDF document text
    • http://branpc.in/ckfinder/userfiles/files/8044590420.pdfIn PDF document text
    • https://vntdc.com/upload/fck/file/vadafidejidivalosudonaxex.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=paper+io+5PDF 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_off0000f7f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001100b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1100B 9964 bytes
SHA-256: af99444370698f287906da64c5ec892f6e8c767e1a7604a6f635e96aedd324db
font_02_sfnt_off00012635.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12635 24272 bytes
SHA-256: 3938f5f8dcc16eaf41074e0ad26d9cedc9da5ab348e490308fcb8dc8cc5c52ec