Malicious PDF — malware analysis report

Static analysis result for SHA-256 c62591a6fb99dc9c…

MALICIOUS

PDF

83.1 KB Created: 2021-09-21 05:03:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0043e2e2fdb9b41ca0a86bae8748650a SHA-1: c3fc1654b9cd0cb1400ad84b27e19005d4e4888b SHA-256: c62591a6fb99dc9c357e5a11e867144a8d69abf28b8b523073fe8cc28b835fbf
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous external URIs pointing to disposable hosting. The embedded URLs suggest an attempt to redirect users to potentially malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://allytemp.ru/uplcv?utm_term=codigo+internacional+de+nomenclatura+botanica+pdf PDF link annotation
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161318c9bd91c6---89647274967.pdfIn PDF document text
    • https://elemonbg.com/Files/File/80176152462.pdfIn PDF document text
    • http://jpind.pl/userfiles/file/nosipinu.pdfIn PDF document text
    • http://cjmfgx.morefriendship.com/upload/files/58594647804.pdfIn PDF document text
    • https://vinaconexmec.vn/uploads/news_file/25015979262.pdfIn PDF document text
    • https://aedwea.com/upload/foto/nodobegifotunepufajebaru.pdfIn PDF document text
    • http://solarexperte.ch/fckeditor/editor/images/file/tigukogamugig.pdfIn PDF document text
    • http://www.saveurspoitoucharentes.com/admin/ckfinder/userfiles/files/komobufikare.pdfIn PDF document text
    • http://abcbyspu.com/ckfinder/images_store/files/siwazivizijekuwuv.pdfIn PDF document text
    • https://volnynaklad.cz/data/file/kadadiwew.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/052a586e8c65abae963b2603d5a7bf0a/lubowubuwud.pdfIn PDF document text
    • http://metalzilemboeventi.com/userfiles/files/90700811868.pdfIn PDF document text
    • https://goez1.com/10005001208290177/ckfinder/userfiles/files/pebekifukolid.pdfIn PDF document text
    • http://benardoutlite.com/admin/fckeditor/fckdata/file/84480856198.pdfIn PDF document text
    • http://hiro-seiko.com/upload/files/10658305885.pdfIn PDF document text
    • http://wingprocess.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/weweluzifitenaxokap.pdfIn PDF document text
    • https://espritgt.com/userfiles/file/rudakogomodizamafuwojug.pdfIn PDF document text
    • http://greensquares.in/userfiles/file///66239431657.pdfIn PDF document text
    • http://learnazia.com/fck/imagesfile/jidutokod.pdfIn PDF document text
    • https://czus-lukasa.sk/userfiles/file/tomolepudumego.pdfIn PDF document text
    • http://mrukseo.pl/userfiles/file/beveseponemove.pdfIn PDF document text
    • https://keluargamimpi2.com/contents/files/99336524926.pdfIn PDF document text
    • http://mikailang.net/userfiles/file/20210912212230_1165422255.pdfIn PDF document text
    • https://lazerom.pro/media/file/domoxi.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_off0000da08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA08 11064 bytes
SHA-256: 1844f6b91115b27a219eda6058ef9f165135de5cae7214d39cf84ddfccca29b8
font_01_sfnt_off0000f35e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF35E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B70 20088 bytes
SHA-256: c3f1d1d8f87ebd20d85e3fe2becb88696ff4acbfbe83a65520b4554eae7eb258

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