Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc36210458bc8903…

MALICIOUS

PDF

81.2 KB Created: 2021-09-13 09:47:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ef4fc66321d2d465cdc0b6bb0a6a2a10 SHA-1: 77d4fc10e15e9566edecc62441f09dedbcefe2da SHA-256: cc36210458bc89039484e15d629d3eff7f82ccd9dec0a110736437813d72a311
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URIs, with a medium-severity heuristic flagging a URI pointing to a raw IP address, indicating a potential phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing lure, likely attempting to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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
  • 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.
  • 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 http://chongqinghaohong.com/upload/files/28261177422.pdf In PDF document text
    • http://studiolauramoschini.it/userfiles/files/16926395291.pdfIn PDF document text
    • http://kiuruvedenlukio.fi/tiedostot/file/nukuxoles.pdfIn PDF document text
    • https://zoomkish.com/basefile/zoomkishcom/files/97714343701.pdfIn PDF document text
    • https://psystat.net/candyticket/uploads/page_images/files/47621477500.pdfIn PDF document text
    • http://usarsenal.it/userfiles/files/7907100892.pdfIn PDF document text
    • https://khangle.vn/uploads/images/files/gejim.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/161338e800c0d8---48180024046.pdfPDF link annotation
    • https://ecoquimica.cl/dinamicos/uploads/file/25804815415.pdfIn PDF document text
    • http://isleford.com/filespath/files/20210904115318.pdfIn PDF document text
    • http://valeneighbors.com/userimages/94419164132.pdfIn PDF document text
    • https://www.elshandmadedesign.nl/ckfinder/userfiles/files/21191884980.pdfIn PDF document text
    • http://electric-kernbichler.at/laviweka.pdfIn PDF document text
    • http://karpatskiles.ru/store/files/80274576095.pdfIn PDF document text
    • https://fentesmakina.com/paket/upload/files/wipekodumuwe.pdfIn PDF document text
    • https://servauto.fr/img/user/file/zinesekemileza.pdfIn PDF document text
    • https://www.stock2morrow.com/ckfinder/userfiles/files/zotufepudipetaxurutuzadak.pdfIn PDF document text
    • https://sedefartphotography.com/resimler/files/periwomutotigipiboxe.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/45556313529.pdfIn PDF document text
    • https://ducthai.vn/userfiles/file/13121686180.pdfIn PDF document text
    • http://serramentisiciliano.it/userfiles/files/43474574176.pdfIn PDF document text
    • http://sbairs.com/datas/files/21099579497.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=attack+on+titan+mobile+androidPDF 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_off0000d933.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD933 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f14a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF14A 10576 bytes
SHA-256: e08a471939b6d77e53a987caba2ee10ce28063f803f9ec740aebc1c56d8fb51b
font_02_sfnt_off0001096d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1096D 17628 bytes
SHA-256: 36b284b5534238373917e23175801f9382db5dd28e89ae9ec30595bada8c5fd8

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