Malicious PDF — malware analysis report

Static analysis result for SHA-256 9066e1f13c65e82d…

MALICIOUS

PDF

69.7 KB Created: 2021-09-20 23:23:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 595263f43b297069dde0faab5e6fd7e3 SHA-1: 931edf4bf6ae5c294c3f8f92921be29c7a38c36b SHA-256: 9066e1f13c65e82db07fb1474407af08c39768a445cfb4e9796e28852a86d204
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to disposable hosting, suggesting it functions as a link farm. One URL, 'https://smidgel.ru/uplcv?utm_term=fast+vpn+premium+mod+apk', specifically mentions 'fast vpn premium mod apk', hinting at a potential lure for users seeking cracked software, which is a common vector for malware distribution. No scripts were extracted, but the structure and numerous external links strongly suggest the PDF is designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://smidgel.ru/uplcv?utm_term=fast+vpn+premium+mod+apk PDF link annotation
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161312b12053cc---40877544456.pdfIn PDF document text
    • http://pamatudarbai.lt/ckfinder/userfiles/files/18147881968.pdfIn PDF document text
    • http://grappin-annat-como.com/userfiles/grappin-annat-como.com/file/tasefafufo.pdfIn PDF document text
    • https://cooperspick.com/files/nexopevoloxofaxoj.pdfIn PDF document text
    • http://fxlcd.com/upload/file/manuzozatokog.pdfIn PDF document text
    • https://cape-electronics.com/media/file/6861141086.pdfIn PDF document text
    • https://didaktika.drmix.cz/uploads/files/87122806467.pdfIn PDF document text
    • http://kozhencherrymtc.org/userfiles/file/kesogujojupok.pdfIn PDF document text
    • http://a-b-i-s.net/layout/bilder/file/16654898938.pdfIn PDF document text
    • https://yellowmangocafe.com/userfiles/file/55757219882.pdfIn PDF document text
    • http://xinyuemu.net/assets/202109/files/20210918211810169027.pdfIn PDF document text
    • https://jurvamartin.com/userfiles/file/63782793148.pdfIn PDF document text
    • http://mofrantech.com/userfiles/file/solifepakisukuronupigumax.pdfIn PDF document text
    • http://jawarakreasi.com/file/97990129607.pdfIn PDF document text
    • http://baihsad.com/userfiles/files/20210918_190049.pdfIn PDF document text
    • https://supermovi.com/userfiles/files/bogafupikiferupiferebis.pdfIn PDF document text
    • http://onestep-tokyo.com/userfiles/file/tilegukejofamifurolizaso.pdfIn PDF document text
    • https://ilonew.tasksplan.com/userfiles/files/43255256987.pdfIn PDF document text
    • http://gamax-motor.cz/data/dokumenty/donerexabaxejoz.pdfIn PDF document text
    • https://www.soroptimist.be/oldsite/intranet/ckeditor/ckfinder/userfiles/images/files/32718269697.pdfIn PDF document text
    • http://skinct.com/upload_file/file/Fl202109160709042554.pdfIn PDF document text
    • http://old.smartplus.pl/ckfinder/userfiles/files/jomanudabinawarifimajexad.pdfIn PDF document text
    • http://www.kevimotor-rock.hu/files/files/90889708514.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_off0000b341.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB341 14956 bytes
SHA-256: 4300458681140444b0f66f0f361e868b5b96da1302f1bdc1a11d9febe20e95aa
font_01_sfnt_off0000d896.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD896 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f0ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0AD 10740 bytes
SHA-256: c4c0c7232811a7781c82b6a1aa5433b847fb3ebf3267532e62bb2259a7cf0b83

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