Malicious PDF — malware analysis report

Static analysis result for SHA-256 1397c19be06aa113…

MALICIOUS

PDF

83.6 KB Created: 2021-09-23 11:36:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 5ea7d36b4e0f74e32790d2f90c4af0b5 SHA-1: 3189d5dadfc17bf5f3ff63dac7990f567cc1514b SHA-256: 1397c19be06aa113ee514d7cf57c6e321058002b483aedfea80c153c241646f6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains numerous external URIs, many of which are hosted on disposable domains, suggesting a link farm designed to redirect users. The presence of 'utm_term=android+emulator+pc' in one URL indicates a potential lure for users searching for specific software. No scripts were extracted, but the PDF structure and numerous external links strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://pixomot.ru/uplcv?utm_term=android+emulator+pc PDF link annotation
    • http://nutranghongngoc.com/media/ftp/file/lukewomupuxeluz.pdfIn PDF document text
    • http://eskuvoiiranytu.hu/blog/file/lukosowikovekolulixegolun.pdfIn PDF document text
    • http://bresky.cz/res/file/30227070001.pdfIn PDF document text
    • http://ventmetal.ru/userfiles/files/xozinebevoma.pdfIn PDF document text
    • http://leeandrewdavison.com/download/74161185294.pdfIn PDF document text
    • http://addon-colsman.somantec.net/ckfinder/userfiles/files/57833516463.pdfIn PDF document text
    • https://piphoto.tw/uploads/files/202109061146573205.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fcf4d175b9---kivagafig.pdfIn PDF document text
    • https://gs-hemeringen.de/ablage/userfiles/files/47623255251.pdfIn PDF document text
    • http://fmmvn.net/userfiles/files/wizizusoxotudoba.pdfIn PDF document text
    • http://xn----8sbfeahwarn6ac1adp3fb2p.xn--p1ai/userfiles/file/wejuposulirakafeso.pdfIn PDF document text
    • https://tarsiman.ee/files/file/84900507788.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16135a1331518a---mekowesejisulajubebi.pdfIn PDF document text
    • http://l-max.ru/userfiles/file/josogojodixosit.pdfIn PDF document text
    • http://bet-balance.com/userfiles/file/16400397142.pdfIn PDF document text
    • http://tiszaikaland.hu/upload/file/libugexebav.pdfIn PDF document text
    • https://ibeguiristain.com/userfiles/files/zewagavozizikija.pdfIn PDF document text
    • https://groupburuemas2.com/contents/files/fepizetizozufugudetamas.pdfIn PDF document text
    • https://mamo-tato.ro/userfiles/file/domabiki.pdfIn PDF document text
    • http://rapet.hu/files/75653255343.pdfIn PDF document text
    • https://zlatartopalovic.rs/files/pojigisunuxurul.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_off0000e607.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE607 10588 bytes
SHA-256: 71f6bcc7f52c876bbff019e4c7526fb1db70537ae6d3ef9679ae0847e9d3397c
font_01_sfnt_off0000fe2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE2E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011640.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11640 16784 bytes
SHA-256: dc44ac260fae3f44db0909c845ecc03b94401e8c626873267bfc06f808bac5d5

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