Malicious PDF — malware analysis report

Static analysis result for SHA-256 05a1112e9886506c…

MALICIOUS

PDF

71.7 KB Created: 2021-09-14 06:17:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3fd490bd73cfb0e71c60729fb0a707f9 SHA-1: c8195346ec5b46d7b792749e6a6612755e702ff8 SHA-256: 05a1112e9886506cf89a528b77cf9f4a16e7a6c3cb137b04defbfe70a9e17601
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was flagged by ML classifiers and ClamAV as a malicious PDF. It contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, a common tactic for phishing or distributing further malware. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically indicates this behavior.

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 https://locktactyuma.com/ckfinder/userfiles/files/13476075214.pdf In PDF document text
    • http://cafegreenwichvillage.com/uploads/files/bekuruvufadavawafukuzipep.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/qkl4hkaht9n45k9i6lq00h68r0/86934299941.pdfIn PDF document text
    • http://seosanhrd.com/userfiles/file/34367289090.pdfIn PDF document text
    • https://bhavanarayanaswamy.org/userfiles/file/42264719823.pdfIn PDF document text
    • http://belniig.by/public/file/ruwefa.pdfIn PDF document text
    • http://udokutscher.de/gfx/userfiles/files/49947745502.pdfIn PDF document text
    • http://bidmitt.com/img/files/file/wirobebijulokozavuputapa.pdfIn PDF document text
    • https://vicotelecom.vn/static/source/images/file/vawufubutotezidadesideze.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1613a208a6f163---80747502091.pdfIn PDF document text
    • https://chsins.tw/uploads/files/202109130524022973.pdfIn PDF document text
    • https://safrano.pl/userfiles/file/18061914488.pdfIn PDF document text
    • http://xsjsbzrw.com/uploads/files/biximawodatizaja.pdfIn PDF document text
    • http://www.lalorraineperdue.com/documents/49151249217.pdfIn PDF document text
    • http://baovecongtruong.com/upload/files/84663099672.pdfIn PDF document text
    • http://altus.pl/userfiles/file/27224636097.pdfIn PDF document text
    • http://tiwtactic.com/userfiles/files/remusixizivasasamikakabej.pdfIn PDF document text
    • https://bisnismedsos.com/userfiles/file/64319244268.pdfIn PDF document text
    • http://areawifi.com/DESARROLLO/userfiles/files/49372546335.pdfIn PDF document text
    • http://moscreen.in/cmsfiles/file/mulavoduzozi.pdfIn PDF document text
    • http://pho32shabu.com/uploads/files/55060995346.pdfIn PDF document text
    • https://cordovajewelry.com/images/file/80720587408.pdfIn PDF document text
    • http://ahjygjg.com/upload_fck/file/2021-9-14/20210914002807660053.pdfIn PDF document text
    • http://4seasonstours.in/userfiles/file/99954336679.pdfIn PDF document text
    • http://101-games.ru/images/uploads/files/wekotodarisuvovomiwamol.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=go+grammar+class+7+answer+keyPDF 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_off0000b8a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8A3 10764 bytes
SHA-256: a4f54ddd98e2dc43451396c843efa6656831a118778d922f03b2691418136099
font_01_sfnt_off0000d199.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD199 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e9ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9AB 15668 bytes
SHA-256: f21095238b69d1c1e6c699ad348f791054c2700ed53d92a409b8951fa627d046

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