Malicious PDF — malware analysis report

Static analysis result for SHA-256 b541e815b1253268…

MALICIOUS

PDF

78.9 KB Created: 2021-09-23 06:47:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c7e3df5c2d112bce1fed0107f2e61297 SHA-1: afa579d56d5c8c7405e03ec2e592136933d3e982 SHA-256: b541e815b12532684f3d554c2950d19737f63155e11a44e1e2908cfa424ad7a2
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript, which is commonly used to redirect users to external sites for phishing or to download further malicious payloads. The PDF also functions as a link farm, with numerous URLs pointing to potentially malicious content, suggesting a distribution or phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://synerhu.ru/uplcv?utm_term=rc+go+cricket+game PDF link annotation
    • http://dokumsuzgec.com/userfiles/files/41196033207.pdfIn PDF document text
    • https://aldwalia.com/userfiles/files/gogareno.pdfIn PDF document text
    • https://3eyamaichi.com/upload/ckfinder_temp/files/20210903122840.pdfIn PDF document text
    • http://diencongnghiepvohoang.com/uploads/files/93305194523.pdfIn PDF document text
    • http://www.ernakulamarchdiocese.org/www/js/ckfinder/userfiles/files/93309479015.pdfIn PDF document text
    • https://retake.dk/ckfinder/userfiles/files/kibenumesuwakelaxefefate.pdfIn PDF document text
    • https://greenways.at/userfiles/file/renuz.pdfIn PDF document text
    • http://automotiveenergy.cz/userfiles/file/vojarunilokupu.pdfIn PDF document text
    • http://xn--zb0bw3kv4s8mn.com/upload/fckeditor/file/budojafepaxaxezidap.pdfIn PDF document text
    • http://jump360.co/upload/files/20210920055443.pdfIn PDF document text
    • https://pianoinprimopianofestival.com/uploads/file/bamitiwogofiwaxolewuzoxa.pdfIn PDF document text
    • http://ibb-online.ru/f/file/sepanomo.pdfIn PDF document text
    • http://wksx.top/images/userfiles/file/84514527372.pdfIn PDF document text
    • http://ballmillfactory.com/d/files/92580586015.pdfIn PDF document text
    • http://newshop.jp/archive/file/vuvalaj.pdfIn PDF document text
    • https://traiteur-troyes-mariage-buffet-aube-10.blaisot-traiteur.fr/ckfinder/userfiles/files/nudugozovimojugajuka.pdfIn PDF document text
    • https://total-sport.pl/img/upload/files/72779131010.pdfIn PDF document text
    • http://www.stadion-zarya.ru/ckfinder/userfiles/files/3993187440.pdfIn PDF document text
    • https://hideab.se/tc/Mediagalleri/file/kodiketupirazunomogi.pdfIn PDF document text
    • http://pfmconsulting.org/survey/userfiles/files/86469083512.pdfIn PDF document text
    • http://mispuntossaga.com/campannas/file/47834458729.pdfIn PDF document text
    • http://jd6618.com/jd6618/file/2021-9/file/LwpCms2021_09_06_20_24_22_1055.pdfIn PDF document text
    • https://matrainagycsalados.hu/userfiles/file/nodoverenudofim.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_off0000d210.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD210 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA22 17328 bytes
SHA-256: bd359c03d4809a1867781d20971c4d1cb7582c826c21e64d601f6614bdbfedfd
font_02_sfnt_off000116cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116CD 10392 bytes
SHA-256: 14a0121798a52685b30bf908af3866dfd2daf94b0e85be69524f417f0ca64ef2

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