Malicious PDF — malware analysis report

Static analysis result for SHA-256 809afe920929e3b3…

MALICIOUS

PDF

72.5 KB Created: 2021-09-13 00:56:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a274c333416685b42ca99cc9a9d7c1dc SHA-1: b42f2b9f21a437b808a1a8cfebcf22585f949e9e SHA-256: 809afe920929e3b399d0afa3a77359681054534663bbf53211d65ad5f663c2bd
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Numerous external URIs were found, with one specifically identified as a link farm designed to redirect users, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and embedded links are consistent with techniques used to deliver malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://smidgel.ru/uplcv?utm_term=satta+game+apk PDF link annotation
    • http://mastrodibaglio.it/userfiles/files/dalisarumemerewenexipebi.pdfIn PDF document text
    • http://smolninskayahotel.com/userfiles/file/miriwisinuredezo.pdfIn PDF document text
    • https://gabinetpro.pl/kosmetyczka/krakow/files/fosorage.pdfIn PDF document text
    • https://eklyps.net/images/file/lopokezu.pdfIn PDF document text
    • https://www.privathospitaletkollund.com/ckfinder/userfiles/files/29553720526.pdfIn PDF document text
    • http://nokianhakkablue.ru/ckfinder/userfiles/files/jidatuvip.pdfIn PDF document text
    • http://kraski-chernila.ru/resources/file/36148211300.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133bb431cf66---72452171890.pdfIn PDF document text
    • http://jsdarvin.com/files/4930679187.pdfIn PDF document text
    • http://lsneotek.com/ckupload/files/11586882798.pdfIn PDF document text
    • https://calienglish.com/ckfinder/images_store/files/25503863671.pdfIn PDF document text
    • https://coherence.cz/userfiles/file/44863146933.pdfIn PDF document text
    • https://davidfoleyinc.com/userfiles/file/50733052278.pdfIn PDF document text
    • http://natalieshuff.com/uploads/file/bifobenutumokujebarijexa.pdfIn PDF document text
    • http://vencedor.coop/images/admin/file/tagaruxoditigozewikisi.pdfIn PDF document text
    • https://korzayithalat.com/spot/admin/fckeditor/userfiles/file/sudexogikumubazikimem.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161367fd7ecb56---42810578846.pdfIn PDF document text
    • http://www.zywawiara.pl/pliki/65214360447.pdfIn PDF document text
    • http://kanizsakran.hu/userfiles/file/18137821450.pdfIn PDF document text
    • http://jinruily.com/UploadFile/file/20210909165549052.pdfIn PDF document text
    • https://arendic.cl/files/41882333161.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/161376e9248b02---7850015297.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_off0000b8f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d103.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD103 17464 bytes
SHA-256: 443184b417c0a0df58bf93fda98257fb99fe95232841f7baa76fbc4b5d9d9033
font_02_sfnt_off0000fe03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE03 10132 bytes
SHA-256: dd390b8e3c07d9d52679836dca1d4017410c79bed6ae734efc59b82e75eeb445

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