PDF malware analysis — malicious · 62c31b71d748ed5b

MALICIOUS

PDF

81.7 KB Created: 2021-09-12 17:03:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26

MD5: 237453f80ee717898b7281987eb8b151 SHA-1: 1d9062dd16219e95e14e10c22aa27dd0462ee14d SHA-256: 62c31b71d748ed5b947c4bae1453fd0d4923c3fc33cf1f80502ae7ca21aa46e8

126 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which are part of a link farm, suggesting a phishing or malware distribution scheme. The presence of external URI heuristics and the 'link farm' detection further support this. Although no scripts were explicitly extracted, the nature of the embedded URLs and the overall structure point towards an attempt to redirect users to malicious content.

Machine Learning

Nyx PDF Classifier malicious score 0.9960

Heuristics 5

ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
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://huntic.ru/uplcv?utm_term=mod+apk+beach+buggy+racing PDF link annotation
- http://romento.com/uploaded_files/userfiles/files/56472240143.pdfIn PDF document text
- http://xn--80akoseq9f.xn--p1ai/userfiles/file/baxaxuwijowi.pdfIn PDF document text
- https://ajansnigde.com/resimler/files/selipoduni.pdfIn PDF document text
- https://cosmopolitanhotel.lastrada.bg/uploads/wysiwyg/files/wubuti.pdfIn PDF document text
- https://sabunwangi.com/contents/files/mudeka.pdfIn PDF document text
- http://onlinepravenconsultant.com/uploads/wysiwyg/files/87016497782.pdfIn PDF document text
- http://nousgarage.com/userfiles/file/97588166714.pdfIn PDF document text
- http://lavalnerina.it/userfiles/file/45865783729.pdfIn PDF document text
- http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135f8087534c---jepuwavixupirevufe.pdfIn PDF document text
- http://tcyy88.com/userfiles/file/2021091217162173499.pdfIn PDF document text
- https://www.paseppe.gr/ckfinder/userfiles/files/zovanupafuvulo.pdfIn PDF document text
- https://mebelihome.ru/upload_picture/2025968865.pdfIn PDF document text
- http://vinczeandlaszlo.com/upload/42226960188.pdfIn PDF document text
- https://www.stnedu.com/ckfinder/upload/files/64439412852.pdfIn PDF document text
- http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/29pf4inqeqem8e2aj7j07vfpi1/20159936446.pdfIn PDF document text
- http://lorofilmes.com/Uploads/ckfinder/userfiles/files/lutakuxiru.pdfIn PDF document text
- http://porpora.info/imagenes/imagenes_contenidos///rejugavovarov.pdfIn PDF document text
- http://cp-tournament.org/ckfinder/userfiles/files/nodusutelubumorafaku.pdfIn PDF document text
- http://smenergy.kr/uploaded/file/519172980613d2942de99d.pdfIn PDF document text
- https://ajansnigde.com/resimler/files/wedobederetalo.pdfIn PDF document text
- https://greenvalleykerala.com/ckfinder/userfiles/files/sifoxirukisonikebofole.pdfIn PDF document text
- http://nieruchomosciklodzko.pl/files/file/sarexopulinajava.pdfIn PDF document text
- http://mgbig.com/upload_fck/file/2021-9-6/20210906100821704153.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.

Filename	Kind	Source	Size
`font_00_sfnt_off0000dc65.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDC65	10920 bytes
SHA-256: `a3a70505148c549dbcc5475210f3d7f2082b2042c439504fcf79092014bb968c`
`font_01_sfnt_off0000f525.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF525	17100 bytes
SHA-256: `48019d46911b538934522867946df643a9f24b460f4ae418ebe5da9455de5c78`
`font_02_sfnt_off000121a4.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x121A4	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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