Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4f5466b317cd5c8…

MALICIOUS

PDF

73.8 KB Created: 2021-10-03 16:54:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 2fa7a78871be4574d27752ffff0085ca SHA-1: 3c865594c9bdb88ebcdffb1bc106d5d2b6b8eefe SHA-256: f4f5466b317cd5c8dcb1c44137720bd31de40772d96f85470ae9457a8af612b1
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://chcial.ru/uplcv?utm_term=how+to+insert+picture+on+pdf+mac PDF link annotation
    • http://gayaarchi.com/userfiles/file/20210913152935.pdfIn PDF document text
    • http://balcimimarlik.com/resimler/files/dizirazibotejuwiti.pdfIn PDF document text
    • http://yjccnc.com/upload/files/28411806152.pdfIn PDF document text
    • http://www.lbtfilm.com/uploads/files/30422721200.pdfIn PDF document text
    • https://www.nitm.ac.in/nitmeghalaya/ckfinder/userfiles/files/gumuwijezoveg.pdfIn PDF document text
    • http://incomingmakedonia.com/files/files/86701420373.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/bb4e44d68029f5bb2b688eda8be67630/33577917773.pdfIn PDF document text
    • http://mitcostruttori.it/userfiles/files/bixowufifadikiw.pdfIn PDF document text
    • http://joomlacode.org/fckeditor/editor/filemanager/img.php?file=file/jifapaju.pdfIn PDF document text
    • http://mp-hd.de/data/aktualnosci_imgs/file/88769258804.pdfIn PDF document text
    • http://77owship.netsociality.com/upload/files/magenuvosig.pdfIn PDF document text
    • https://bhiringisamsankalimandir.org/ckfinder/userfiles/files/38986990171.pdfIn PDF document text
    • http://sangjeom.com/userfiles/file///benepamu.pdfIn PDF document text
    • http://aec.dbodm.com/js/upload/ckfinder/files/gotebexinulivupirofowuvit.pdfIn PDF document text
    • https://firsatpin.com/calisma2/files/uploads/romaxolepinubi.pdfIn PDF document text
    • http://195exim.com/datas/files/bizoxanegemuvofujumapid.pdfIn PDF document text
    • https://mamalight.net/business_school/uploads/file/vuzexisasin.pdfIn PDF document text
    • https://datawire.gr/files/files/bizafimujekumubupe.pdfIn PDF document text
    • http://honeystraw.com/uploadfiles/file/tilekikovabedu.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16147acb3c888b---mixorir.pdfIn PDF document text
    • http://lotusromeo.fr/app/webroot/files/userfiles/files/savitiwibosupolilorizut.pdfIn PDF document text
    • http://hoangduy.vn/vn/files/33673978801.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_off0000b714.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB714 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cf26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF26 19140 bytes
SHA-256: 9e81548e18243f331995b3a20a2b2bb4d863e74c31f4b8722111e46d462a0014
font_02_sfnt_off00010064.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10064 10912 bytes
SHA-256: 0a4ea053b5588ef08579dba3cbfcceec06645a13862d6a2286a6295f63cf8eaf