Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff0f6b2648587760…

MALICIOUS

PDF

75.5 KB Created: 2021-09-13 15:08:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8df72dd0cecf4ab63c4ea5af2c0a5e00 SHA-1: 7ed5e371dfa3af85edbfe24671cc641c6e688a8b SHA-256: ff0f6b264858776031b135918d20b30ecfa41873e41be425ebad3c0fc90ead64
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of external links, many pointing to disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript is likely used to facilitate the redirection to malicious sites or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 https://am-system.eu/ckfinder/userfiles/files/jogopisowovuvikasu.pdf In PDF document text
    • https://ptogel1.com/contents/files/junim.pdfIn PDF document text
    • https://totalsewa.com/userfiles/file/7347225280.pdfIn PDF document text
    • https://acavacecio.it/userfiles/files/22061441971.pdfIn PDF document text
    • https://rwd.webseo.tw/upload/files/buwiguxosuk.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b24a8825d7---wolegojatadasufusiw.pdfIn PDF document text
    • https://valstybestarnyba.com/upckfinder/files/98766287760.pdfIn PDF document text
    • http://reclameindex.nl/images/uploads/91471748977.pdfIn PDF document text
    • http://1careglobal.com/upload/files/pelelilasomofuwur.pdfIn PDF document text
    • https://www.bosingels.nl/ckfinder/userfiles/files/risinironivolalomux.pdfIn PDF document text
    • http://optykglowacki.pl/obrazki/files/34523728119.pdfIn PDF document text
    • http://dogomanhnghia.com/uploads/files/wujibovetoge.pdfIn PDF document text
    • http://chinajessie.com/seadata/data/uploads/img/file/163122918612.pdfIn PDF document text
    • http://eperon-kochersberg.com/img_db/84447960126.pdfIn PDF document text
    • http://www.thegrcinstitute.org/app/webroot/js/ckfinder/userfiles/files/perumesidanazanezo.pdfIn PDF document text
    • http://snp-ent.com/files/fckeditor/file/909043246139c39b79183.pdfIn PDF document text
    • https://www.tulsarad.com/my_content/js/ckfinder/userfiles/files/266815805.pdfIn PDF document text
    • http://cyc.cz/pictures/clanky/files/xegabip.pdfIn PDF document text
    • http://globalcenterhotels.com/bot/ckfinder/uf/files/59803278324.pdfIn PDF document text
    • http://nasfthr.com/userfiles/file/41683036213.pdfIn PDF document text
    • https://khotelmarket.com/FileData/ckfinder/files/20210904_F5736518EE3F4E23.pdfIn PDF document text
    • http://morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613449612141a---taxizezofupude.pdfIn PDF document text
    • http://rapabzenec.cz/obrazky/files/xeserezupedujigewijin.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=getting+podcasts+on+androidPDF link annotation
    • 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_off0000c65d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC65D 16256 bytes
SHA-256: 660ce312214f20f6eb559e990efccc5e5fe39737b133d9c771e492118299352a
font_01_sfnt_off0000f052.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF052 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010869.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10869 10680 bytes
SHA-256: 0e982c80fe9f27c0b34f3dc8e9062bd9bbe15f35fb823457565ab369db7d1ee4

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