Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ced5da7b6d75888…

MALICIOUS

PDF

69.5 KB Created: 2021-09-29 04:56:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: a05856cff745e2f76644400aea5e4e9a SHA-1: 657f9c898dfb2ca0b1cc8800c07061054af4fa29 SHA-256: 1ced5da7b6d758880f2d0dd31ab7636df911a2e60bc400d71763fff94b16708f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and numerous embedded URLs suggest it's designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://synerhu.ru/uplcv?utm_term=cast+of+the+hate+u+give PDF link annotation
    • http://lobanowscy.pl/userfiles/file/46000580159.pdfIn PDF document text
    • https://songhong.info/userfiles/file/31959768703.pdfIn PDF document text
    • http://ubest.ru/images/file/bagubosenetulix.pdfIn PDF document text
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd5b6dba4b---resalonogo.pdfIn PDF document text
    • http://vagtteam.dk/userfiles/Files/59099623508.pdfIn PDF document text
    • http://spielundlicht.de/content_provider/documents/files/dewofamikowowowogawonazoz.pdfIn PDF document text
    • http://voszveszprem.hu/_user/file/72821895655.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/16148e007a6f09---kupop.pdfIn PDF document text
    • http://balaton.varosom.hu/userfiles/files/93817489071.pdfIn PDF document text
    • http://www.rupankar.com/fckimages/file/fabozifavulozunimexafap.pdfIn PDF document text
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/musirejifaf.pdfIn PDF document text
    • http://kfbma.org/files/fck/file/20577175357.pdfIn PDF document text
    • https://peptidturkiye.com/ckfinder/userfiles/files/36102452316.pdfIn PDF document text
    • http://uniquecharacters.com/upload/files/54606840819.pdfIn PDF document text
    • http://alltechsro.cz/files/vitowegirebenelifo.pdfIn PDF document text
    • http://marinda.ru/pics/images/file/79929484059.pdfIn PDF document text
    • http://hoanggiaphatland.com/uploads/image/files/wufagimuxadanukumok.pdfIn PDF document text
    • http://lifecontinues.ru/images/files/23541419271.pdfIn PDF document text
    • http://koyomisushi.com/uploads/files/pifaxirivitalaxolodi.pdfIn PDF document text
    • http://gediklimakinahidrolik.com/resimler/files/revipopegozufetifoten.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/97274621216.pdfIn PDF document text
    • https://sindhuinvestment.com/ckfinder/userfiles/files/82947749897.pdfIn PDF document text
    • https://szalkasszorutacskok.hu/app/webroot/files/content/files/xopodazerazedejadikatej.pdfIn PDF document text
    • http://holmeslawfirm-iowa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mujixil.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_off0000af74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF74 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c786.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC786 16428 bytes
SHA-256: 7e59e3e5d33d60c7bab9c98e54e17f5cfeb96df8e9f891185f40151cf1c938f9
font_02_sfnt_off0000f12b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF12B 10440 bytes
SHA-256: 73bb10529dc539daf435d900b81dd463df4abb879ccef15e9442f0edc2042bdf