Malicious PDF — malware analysis report

Static analysis result for SHA-256 f04a7736ca2f4b24…

MALICIOUS

PDF

87.1 KB Created: 2021-09-23 22:13:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e6a3cf4cadd368b7b7bb621b2a811fc1 SHA-1: 9224f65f069c20660ec8d2004536383316ac2311 SHA-256: f04a7736ca2f4b24fdaee877479426baf27181e735d011c141e4fab1407aa586
170 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of embedded JavaScript and numerous external URIs, including one pointing to a raw IP address, suggests the PDF is designed to host or redirect to malicious content. The heuristic 'SE_URGENCY_LURE' and 'SE_DOWNLOAD_BUTTON' further support a phishing or scam pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://infrive.ru/uplcv?utm_term=breath+of+the+wild+piggyback+pdf PDF link annotation
    • http://rosritual.su/app/webroot/js/ckfinder/userfiles/files/30135232524.pdfIn PDF document text
    • http://lakshimi-kaatsu.com/user_data/packages/default/imgfiles/22130963744.pdfIn PDF document text
    • http://delfosventures.net/userfiles/files/pezuwa.pdfIn PDF document text
    • http://trungtinjsc.vn/upload/FCK/file/31337101761.pdfIn PDF document text
    • http://185.33.116.145/~acus01/upload/files/78591851893.pdfPDF link annotation
    • http://slabowidzacy.smprzemysl.pl/ckfinder/userfiles/files/babevofoninu.pdfIn PDF document text
    • http://premiumdrinks.eu/userfiles/38066696763.pdfIn PDF document text
    • http://xn--eyt274i.com/upload/files/makujakug.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/56844543931.pdfIn PDF document text
    • http://euroteam.vn/ckfinder/userfiles/files/kizapapus.pdfIn PDF document text
    • http://pitin-akutsu.com/js/upload/files/36012381227.pdfIn PDF document text
    • http://gaongonmaiphuong.vn/webroot/img/files/53670408609.pdfIn PDF document text
    • http://zhfangyuan.com/uploadfiles/files/38951140897.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/734a5ba514b7143c686004efcaf2161a/jitififubukaxuketip.pdfIn PDF document text
    • https://cheeselicious.net/UserFiles/file/buronosidugiwolamupolul.pdfIn PDF document text
    • http://mientrungland.net/uploads/image/files/miziloj.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b276ad7c96---misanogutuvotadusavurek.pdfIn PDF document text
    • http://hmconcretemixingplant.ru/d/files/banisabofeb.pdfIn PDF document text
    • http://xn--b1adbbbaeqjtsflbfms0e.xn--p1ai/pict/file/93312081483.pdfIn PDF document text
    • http://pscemetery.com/userfiles/file/78549445285.pdfIn PDF document text
    • https://bgg.pirkitpadangas.lt/ckfinder/userfiles/files/lozalosofazomovavilokixej.pdfIn PDF document text
    • http://electriccityusa.com/images/fck_uploads/file/60943907737.pdfIn PDF document text
    • https://ckfinder.pamlskovnik.cz/ckfinder/userfiles/files/36429964779.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/kisuvejinirefedijetaj.pdfIn PDF document text
    • http://autoscuolepintozzi.it/userfiles/files/watubu.pdfIn PDF document text
    • http://ledspectrumthai.com/ckfinder/userfiles/files/jasupida.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_off0000ef64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF64 11112 bytes
SHA-256: 96730b2755dab7ec4c0b4ee4c25ba3b3e65f079fb9a0024417d768fde6dc0687
font_01_sfnt_off00010918.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10918 17440 bytes
SHA-256: afadb8275d4c828cc5f85655478e1fe1b50e2750dda4d4f42b63a80f92ccd307
font_02_sfnt_off000136b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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