Malicious PDF — malware analysis report

Static analysis result for SHA-256 85b25103df113712…

MALICIOUS

PDF

80.1 KB Created: 2021-09-18 07:38:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 23681241316d5c728fef3c4b7b513307 SHA-1: d0429872761d07f182d3e9197a69804174cc4db6 SHA-256: 85b25103df113712b5107fca699cafcca8edf906e6c7c678a8a02f0e17f52cdf
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to various domains, many of which are likely part of a link farm designed to obscure the final destination. The presence of 'utm_term' parameters suggests tracking or redirection, common in phishing campaigns. No scripts were extracted, but the overall structure and heuristic firings indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://kes.org/upload/editor/files/39308582718.pdf In PDF document text
    • http://giayviettri.com/img-ftec/files/werodemakejivata.pdfIn PDF document text
    • http://mwcapital.net/ckfinder/userfiles/files/74423286426.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16136dc1b42706---57823528635.pdfIn PDF document text
    • https://fundacionamigosdelmarcaribe.ong/ckfinder/userfiles/files/92867751362.pdfIn PDF document text
    • https://xn--fct5g39pjpo.tw/upload/leakstop/files/3234794606.pdfIn PDF document text
    • https://farmacieitaliane.com/documenti/file/5604187990.pdfIn PDF document text
    • http://abbwingslynnhaven.com/uploads/files/mufovupewasoguxasike.pdfIn PDF document text
    • http://ketoanantamhcm.com/uploads/files/gadijogorilu.pdfIn PDF document text
    • http://mrtowing.ca/Lawyers/userfiles/file/deniresulenepovodim.pdfIn PDF document text
    • http://okfilm.kr/userData/board/file/60389947923.pdfIn PDF document text
    • http://hotelamadeustorino.com/userfiles/files/42059665824.pdfIn PDF document text
    • https://camping-du-lac-dijon.com/userfiles/fichiers/surawikejemepanakulido.pdfIn PDF document text
    • http://vertracapital.com/uploads/files/31372725388.pdfIn PDF document text
    • http://workcoop.org/fckeditor/userimages/file/20210915154903.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1614147132c190---fefafarexoxezalaxegezi.pdfIn PDF document text
    • http://areaengineeringsrl.eu/userfiles/files/xapimi.pdfIn PDF document text
    • https://aljuboori.com/userfiles/files/43490875487.pdfIn PDF document text
    • https://zhongzing.com/uploads/files/202109171903036349.pdfIn PDF document text
    • http://teusz.pl/UserFiles/file/57764530290.pdfIn PDF document text
    • https://weddingitaly.jp/images/file/xabolamo.pdfIn PDF document text
    • https://nhanloc.net/userfiles/file/xawijetufam.pdfIn PDF document text
    • http://aqcorth.specialty-match.com/upload/files/vojesatoguratatekipuga.pdfIn PDF document text
    • https://cs-nippon-cp.com/mailmagazine/upload/files/wubem.pdfIn PDF document text
    • http://zkmeiqi.com/admin/ckfinder/upfile/files/17845962970.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=vpn+panda+pro+mod+apkPDF 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_off0000d763.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD763 10076 bytes
SHA-256: fccb7e26ba8cc5ecc857bcf002852cee9d4d247e62b9e3dd05c75d7a4b259624
font_01_sfnt_off0000edb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB7 17516 bytes
SHA-256: 9d94a1bb83f67bd4d002e9365b14391547a562f06f7a3f7aa2f60ab0cb5d698e
font_02_sfnt_off00011ab2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AB2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1