Malicious PDF — malware analysis report

Static analysis result for SHA-256 886aa3d6a898fc89…

MALICIOUS

PDF

82.0 KB Created: 2021-09-20 09:09:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9ce0d31b03c75d69c51b692912d2ed16 SHA-1: 6a0a33ea842783e95e97e505fc200ad39da0aba8 SHA-256: 886aa3d6a898fc899b6b2442e2e78fcb93d21fbb51264a4299484b3235279c23
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of embedded JavaScript and numerous external URIs, many hosted on disposable domains, strongly suggests a phishing or malware distribution scheme. The PDF likely attempts to lure users to one of these external sites, which could host further malicious content or phishing forms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://wagnerpc.com/userfiles/files/madigibujipeputegim.pdf In PDF document text
    • http://ulv-fogger.ru/d/files/rumodaxafanego.pdfIn PDF document text
    • http://www.ortodonciaelisafarache.com/ckfinder/userfiles/files/36289859950.pdfIn PDF document text
    • http://pharmorgsyn.com/upload/files/romaxunizefutez.pdfIn PDF document text
    • http://jcon-aps.dk/userfiles/file/73702817218.pdfIn PDF document text
    • http://seoaudytor.pl/userfiles/file/39019065691.pdfIn PDF document text
    • http://pazzo.jp/js/upload/files/beribojudipe.pdfIn PDF document text
    • https://et-auditing.com/userfiles/files/44058438261.pdfIn PDF document text
    • https://lawina-radom.pl/files/file/32252590145.pdfIn PDF document text
    • http://myshiou.com/uploads/files/202109110653032566.pdfIn PDF document text
    • http://liderzy.natura2000.pl/imgturysta/files/wetet.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/161478dc0cc0bb---64726651600.pdfIn PDF document text
    • http://rtm-plus.com/ckfinder/userfiles/files/32668023384.pdfIn PDF document text
    • https://ncsccalgary.com/userfiles/files/27209149861.pdfIn PDF document text
    • https://chulintemple.org/CKEdit/upload/files/ziwowoka.pdfIn PDF document text
    • https://bimstudioinc.com/media/files/zadolufoxenanu.pdfIn PDF document text
    • https://thucphamtruongxanh.com/Upload/files/70516473978.pdfIn PDF document text
    • https://aarushimukhwas.idealviews.com/userfiles/files/nadira.pdfIn PDF document text
    • http://panziofabian.hu/fck_kepek/vabezataridufelurogel.pdfIn PDF document text
    • http://bora.su/ckfinder/userfiles/files/55701501618.pdfIn PDF document text
    • https://akvanova.ru/sites/default/files/31908802098.pdfIn PDF document text
    • http://amindoost.ir/images/upload/files/lodoxigejokupali.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=fgl+go+apkPDF link annotation
    • https://www.rt9.rspo.org/ckfinder/userfiles/files/72175116758.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_off0000dc7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC7D 9800 bytes
SHA-256: 593173afc9546fba72f7a31e745ce1fd82b7c03a811b405ee293d0fbb0c26da1
font_01_sfnt_off0000f209.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF209 18680 bytes
SHA-256: d02d8dc9bed3c9ca477c518ca53b41748eea1781439fee48b47381a1bb683e8e
font_02_sfnt_off00012308.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12308 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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