Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d562d5ef065df5d…

MALICIOUS

PDF

75.1 KB Created: 2021-09-16 02:46:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: cdf1ca61ff168acf40e338056d2af654 SHA-1: 7a2b74647f6f351e6beddcf6a6f5cfb90bc4167e SHA-256: 1d562d5ef065df5d5a5497187be5397cdfd406720c8a9e0b031384a8eacb1368
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded links, many of which point to suspicious or disposable domains, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure itself facilitates the redirection to malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 https://wastran.ru/uplcv?utm_term=moded+game+apk PDF link annotation
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613fe55bc95a4---razopixawuwizanudixibo.pdfIn PDF document text
    • http://studiocalderini.it/userfiles/files/wipaxazavaragomalaruzin.pdfIn PDF document text
    • http://vivaldiskibus.com/FileData/ckfinder/files/20210913_C4F789905A8B91DD.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/2m20hjlfb9dca87ajgbnullci4/kajefiwilu.pdfIn PDF document text
    • https://hantverkarenisandby.se/UserFiles/files/38781026514.pdfIn PDF document text
    • http://energyexcess.com/userfiles/file/15888754548.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/lusap.pdfIn PDF document text
    • https://akemi.ro/hirek/file/72563068410.pdfIn PDF document text
    • http://www.moyekolodin.com/files/goruponadufa.pdfIn PDF document text
    • https://299-45.com/CKEdit/upload/files/64254075637.pdfIn PDF document text
    • http://latiendasegura.com/contable_prueba/userfiles/file/nowapukutemipab.pdfIn PDF document text
    • http://damnoen.com/ckfinder/pho/files/zixoronabupen.pdfIn PDF document text
    • http://vyrukrc.lt/userfiles/file/38986156479.pdfIn PDF document text
    • https://cityface.cz/res/file/33805942153.pdfIn PDF document text
    • http://mikailang.com/userfiles/file/20210914094507_1438256257.pdfIn PDF document text
    • http://poorclarescork.ie/images/kewapiluxuxevu.pdfIn PDF document text
    • http://riggi.ru/userfiles/file/89953936271.pdfIn PDF document text
    • http://mlight.cz/archiv/file/vinuxiboloxizufatojaduma.pdfIn PDF document text
    • http://naasschoolofmotoring.com/fckeditor/userfiles/file/kuxapobuguroridegin.pdfIn PDF document text
    • https://lingchuanfloor.com/app/webroot/userfiles/files/40685272552.pdfIn PDF document text
    • http://cu-hinothai.com/ckfinder/userfiles/files/16066127562.pdfIn PDF document text
    • http://anninh247.info/upload/files/zibiru.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_off0000c2b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2B2 10212 bytes
SHA-256: e2624e09bc70e002b173f628d8dff290142bda15250607b22fa6e16047a256ce
font_01_sfnt_off0000d965.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD965 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f177.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF177 17504 bytes
SHA-256: 85c5e5e679b6e4fe1ecb5bdc11fde16c0f9690d8b96ede6bdf2c45a063091559

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