Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a273979638ca7bd…

MALICIOUS

PDF

78.3 KB Created: 2021-09-12 05:30:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: cd75f7abfb9b0313e1c024fa291e5340 SHA-1: ff5d1e1a138d102cc477f77f46708886a1c17ae3 SHA-256: 9a273979638ca7bdc79bf5887f85a7f466ddaf6131f7cc8ae596f56fa1e51076
126 Risk Score

Malware Insights

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

The sample was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. The PDF contains numerous external URIs, suggesting it functions as a link farm or lure to external malicious sites. The presence of many distinct hosts and UTM parameters in the URLs points towards a phishing or scam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://infrive.ru/uplcv?utm_term=gt+racing+2+offline PDF link annotation
    • http://tvcsoltau.de/userfiles/file/pitubodukazoxuwobapibuz.pdfIn PDF document text
    • https://electroagro.es/pub/files/lojejakozad.pdfIn PDF document text
    • http://adbuilder.at/ckfinder/userfiles/files/37168921038.pdfIn PDF document text
    • http://abwlanham.com/uploads/files/pelovavufaxunipazuzewa.pdfIn PDF document text
    • http://pogologistics.com/ckfinder/userfiles/files/xukiraraxipazoxe.pdfIn PDF document text
    • https://rugsinc.in/UserFiles/files/vovabikujobevogowa.pdfIn PDF document text
    • https://hnhaa.com/userfiles/tnejp/files/26780622972.pdfIn PDF document text
    • https://aynispirit.nl/userfiles/file/77109107666.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///21682106767.pdfIn PDF document text
    • https://www.peltonfell.org.uk/ckfinder/userfiles/files/pikewugi.pdfIn PDF document text
    • http://novena99.com/uploads/files/202109101805568456.pdfIn PDF document text
    • https://5udua.com/contents/files/33883790939.pdfIn PDF document text
    • http://igigeothermal.jp/userfiles/file/17543643176.pdfIn PDF document text
    • http://tznjl.com/userfiles/files/30197064275.pdfIn PDF document text
    • https://associazionebriciole.it/public/file/puxaruvufoge.pdfIn PDF document text
    • http://jinyezi.cn/upload/tovoselulamaga.pdfIn PDF document text
    • http://edmo-cars.nl/images/file/valeselekibadidigazoxu.pdfIn PDF document text
    • http://antichigelsi.it/userfiles/files/lagopekasadidenagitebuv.pdfIn PDF document text
    • http://hainfelderteich.at/45084850846.pdfIn PDF document text
    • http://machin.kr/userData/board/file/tisudobamiloviba.pdfIn PDF document text
    • http://cuiquji.net/d/files/xaromumurigugoduluvugapu.pdfIn PDF document text
    • http://nghieuphong.com/upload/files/kufirepurutopizarirop.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/161371a176669c---65917644399.pdfIn PDF document text
    • http://pol2-simf.ru/userfiles/file/87862495345.pdfIn PDF document text
    • http://bortran.com/upload/image/file/20210902125152.pdfIn PDF document text
    • 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_off0000cca8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCA8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e4bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4BF 10500 bytes
SHA-256: affd43f7ac23e9b46c46f8d097e1d6e1cc19477263af408ef57b77424c67ed6d
font_02_sfnt_off0000fcd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCD8 17800 bytes
SHA-256: 60611f290d9b62a948c11ef13845f51dcc670a73eccc5fda53e949fb8d9a27f8

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