Malicious PDF — malware analysis report

Static analysis result for SHA-256 c30156a17482e68b…

MALICIOUS

PDF

68.9 KB Created: 2021-09-27 21:00:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 17b289217df700245b5b1fbf2a63f884 SHA-1: 133b3219cc9342f33ac391125246c73458cdc254 SHA-256: c30156a17482e68bebb4d0c1f6c452d136121478d31d98fab6abf1917dcc7845
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many of which are on disposable hosting and utilize UTM parameters, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards it being used to redirect users to malicious sites, potentially for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://crewmak.ru/uplcv?utm_term=good+night+quotes+love PDF link annotation
    • https://arerp.kr/data/file///fatoxojife.pdfIn PDF document text
    • http://ventensis.lt/public/ckfinder/userfiles/files/56547876927.pdfIn PDF document text
    • http://harekatmemuru.com/images/Media/files/bumuwoledufufufujotut.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1614f5ca4eed0a---ruzigagusadifokilivi.pdfIn PDF document text
    • https://gesema.com/UserFiles/file/64415048466.pdfIn PDF document text
    • http://ctm.it/userfiles/file/55737410161.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/galunimilofedaletaf.pdfIn PDF document text
    • http://dycelife.com/userfiles/file/61713441924.pdfIn PDF document text
    • http://ryanoomen.nl/uploadimages/files/sitidulunagasopa.pdfIn PDF document text
    • http://maaramachandifpo.com/admin/userfiles/file/figiwejuxozisopagewomav.pdfIn PDF document text
    • https://kfmaccounting.com/webroot/img/content/files/94445097545.pdfIn PDF document text
    • http://margheritango.it/userfiles/file/dozotesika.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/855db5c421851769c0acec1f11db4fe1/jixotisazaxuvigexuvuwota.pdfIn PDF document text
    • https://speakingparrot.com/upload/ckfinder/files/supimirozojade.pdfIn PDF document text
    • https://onderdurdu.com/upload/ckfinder/files/zogibugepukowukejunefog.pdfIn PDF document text
    • http://topoint.cc/userfiles/fckFile/20210912203202.pdfIn PDF document text
    • https://micro-logic.ro/images/uploaded/file/93419277220.pdfIn PDF document text
    • https://helicopterleasingservices.com/userfiles/files/73429374611.pdfIn PDF document text
    • http://xn--80aikni6a0b.xn--p1ai/images/file/sowepo.pdfIn PDF document text
    • http://steelfurniturecn.com/d/files/94101842190.pdfIn PDF document text
    • http://lamachine.nl/userfiles/file/86402579196.pdfIn PDF document text
    • https://silverlabpupsforsale.com/userfiles/files/6749852619.pdfIn PDF document text
    • https://villadelauca.com/userfiles/file/raxokuxodinowet.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_off0000ae10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE10 15288 bytes
SHA-256: 982427e33c30cb01b9f82a0e89d172fed08a9bd4ba2c6b2cf36067025275be70
font_01_sfnt_off0000d497.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD497 10616 bytes
SHA-256: 642fe067a0096f76154021a82685b73f5de57dc0f73e8020f32034daa0c5fb8d
font_02_sfnt_off0000ec4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC4E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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