Malicious PDF — malware analysis report

Static analysis result for SHA-256 aee0f3a24de8eb65…

MALICIOUS

PDF

82.1 KB Created: 2021-09-20 19:19:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ea79cafb3979ad45e15a6aed1ce3e1a3 SHA-1: aa21ec51a04f0e6c5525cffbb0f0e3869be87b60 SHA-256: aee0f3a24de8eb65882017f525c1c34e7f1bc12c779d2aa4ccdea8ab6ab04528
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URIs pointing to external websites, many of which are hosted on disposable domains or use UTM parameters, indicating a likely phishing or malware distribution attempt. The document body is heavily obfuscated and unreadable, suggesting it is designed to conceal its malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 https://synerhu.ru/uplcv?utm_term=new+indian+movies+online+free PDF link annotation
    • http://artvideo74.ru/upfiles/files/giveromixizefe.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614432d0e7026---81114734218.pdfPDF link annotation
    • https://alutat.com/data/file/15323098133.pdfIn PDF document text
    • http://iehyun.com/editorupload/file/sikenividexalutukevebeza.pdfIn PDF document text
    • http://uniontsg96.ru/admin/ckfinder/userfiles/files/taxogakuniv.pdfIn PDF document text
    • https://infosantiere.ro/userfiles/file/27240402813.pdfIn PDF document text
    • http://pmrs.ps/userfiles/file/39621020086.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e22943f125555a81f95430d6a53fd4d0/92201371799.pdfIn PDF document text
    • http://gmei.lt/ckfinder/userfiles/files/81874192486.pdfIn PDF document text
    • https://alpasol.e-giant.net/upload/files/laxapowitiroselab.pdfIn PDF document text
    • http://kdwatch.net/upload/files/2021091406075422.pdfIn PDF document text
    • https://infiniteprospects.com/FCKeditor/file/28242055698.pdfIn PDF document text
    • https://a-metal.e-giant.net/archive/file/files/ladijepixif.pdfIn PDF document text
    • https://nepalihemp.com/ckfinder/userfiles/files/bowixelid.pdfIn PDF document text
    • http://rgn2u.com/userfiles/files/deneligew.pdfIn PDF document text
    • https://dolnoslaskialarmsmogowy.pl/imgturysta/files/fuwidudiwuxutaguri.pdfIn PDF document text
    • http://eternaseguros.net/files/files/39623653351.pdfIn PDF document text
    • http://ettorebelfioreliutaio.it/userfiles/files/lupalomowefelagexiratul.pdfIn PDF document text
    • http://www.moyekolodin.com/files/xekar.pdfIn PDF document text
    • https://taperagi.com/contents/files/bisabor.pdfIn PDF document text
    • http://geriatriccarenewjersey.com/userfiles/files/90794423617.pdfIn PDF document text
    • http://ncteonline.com/userfiles/file/93834839401.pdfIn PDF document text
    • http://envigest.cz/upload/file/rojodi.pdfIn PDF document text
    • https://dom4m.com/userfiles/files/fegepamimojamujab.pdfIn PDF document text
    • http://hooleihomes.com/cms_images/file/rajifepugewunab.pdfIn PDF document text
    • http://sirmamedia.com/ckfinder/userfiles/files/biwazomowuzoxojoruxo.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_off0000decf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDECF 10548 bytes
SHA-256: 28f4a8184883821698389c23b4f7cef89472cc8304b0e72b1a2a032c9949505d
font_01_sfnt_off0000f6e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010ef2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EF2 16992 bytes
SHA-256: 4b0b8175a47ca5d83382a92b8c761b1ea33f8a6a1341ee0c67cee5987ce05619