Malicious PDF — malware analysis report

Static analysis result for SHA-256 172a976a98541b89…

MALICIOUS

PDF

77.9 KB Created: 2021-09-26 02:09:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2b13ac75c73478061dc3674d27e3c5fe SHA-1: 4f1a95ae37eeb487ce676f3817a69bb2f1e6fd7e SHA-256: 172a976a98541b893b2d7034c54fe52c658731fa78b9ae29a6ae0a1b8171cd98
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous external URLs, suggesting it functions as a link farm or phishing lure. The PDF structure and embedded URIs point towards an attempt to redirect users to potentially harmful websites, consistent with a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://archism.ru/uplcv?utm_term=logo+quiz+level+2 PDF link annotation
    • https://jjpremiers.com/files/wefulovaliduwaw.pdfIn PDF document text
    • https://tractorpulling-emmeloord.nl/upload/file/voxiripuforurudekowasogas.pdfIn PDF document text
    • http://bosch-elektronarzedzia.pl/catalog/file/jotexalujif.pdfIn PDF document text
    • http://hongsung114.com/files/fckeditor/file/96814537495.pdfIn PDF document text
    • http://millecolori.it/images/file/wikovupewolofukemexabe.pdfIn PDF document text
    • http://special-pharma.com/upload/files/fatemizerekojedam.pdfIn PDF document text
    • http://encino.ilovepokebar.com/uploads/files/luxupem.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614fa14ce79bd---farurupukojulun.pdfIn PDF document text
    • http://dobre-jaja.com/Upload/file/92789854359.pdfIn PDF document text
    • https://careerroots.net/ckfinder/userfiles/files/nusamulowada.pdfIn PDF document text
    • https://ngaa.org.au/application/third_party/ckfinder/userfiles/files/lurupivenivajuvanug.pdfIn PDF document text
    • https://securitydm.eu/slicice/file/mojubekunuti.pdfIn PDF document text
    • http://pp-aqua.com/userfiles/files/19399453425.pdfIn PDF document text
    • http://wignaccent.com/FCKeditor_2.6.3/userimages/file/20210904053438.pdfIn PDF document text
    • https://shian-jin.com/UserFiles/files/tepado.pdfIn PDF document text
    • http://herium.net/FileData/ckfinder/files/20210911_93791E633B5F4E18.pdfIn PDF document text
    • http://architectureanddesign.it/userfiles/files/20603350888.pdfIn PDF document text
    • http://1mosref.ru/ckfinder/userfiles/files/13441063028.pdfIn PDF document text
    • http://thietbimaugiao.vn/Images_upload/files/gesitulumes.pdfIn PDF document text
    • http://xn--80aamwn.xn--p1ai/userfiles/file/9186584823.pdfIn PDF document text
    • https://successalpha.team/upload/files/temaforutowowuwowovulaxax.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_off0000c787.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC787 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000df99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF99 20172 bytes
SHA-256: 0503dd80a566bf4a1e31bc7f46421d0cc0846ab61edb9abc367f2414d5d477b0
font_02_sfnt_off0001145d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1145D 10100 bytes
SHA-256: 37d44edd973915ea24f07b6ba7e0334db855c932f3a7cb5f7f1544b83cc2ae47

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