Malicious PDF — malware analysis report

Static analysis result for SHA-256 affa30fb0f26ad6e…

MALICIOUS

PDF

80.1 KB Created: 2021-09-17 09:49:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9b21426fa746051720f49ac97594c336 SHA-1: 26cbfeb93227ba1c0a64f48186ebd96325bae3ec SHA-256: affa30fb0f26ad6e80a5fbdef5548ab829b73ad891cd89ff067c55e95dba03aa
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which are hosted on disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://philabc.ru/uplcv?utm_term=netter%27s+head+and+neck+anatomy+for+dentistry+pdf PDF link annotation
    • http://studioguatta.it/userfiles/files/nomabitazujidijabirasapa.pdfIn PDF document text
    • https://szalkasszorutacskok.hu/app/webroot/files/content/files/xazurubezuguzi.pdfIn PDF document text
    • http://ikuma-car.com/js/upload/files/83194577468.pdfIn PDF document text
    • http://abaj.cz/UserFiles/File/43438328071.pdfIn PDF document text
    • http://jikaramen.com/uploads/files/xugobapirofudagofili.pdfIn PDF document text
    • https://geneticapanama.com/userfiles/file/5938423766.pdfIn PDF document text
    • http://reicar.dk/userfiles/file/68747317464.pdfIn PDF document text
    • http://jumpinfit.it/userfiles/files/82794623149.pdfIn PDF document text
    • http://vendsol.com/userfiles/file/58529733525.pdfIn PDF document text
    • https://geloracinta.com/contents/files/10163131143.pdfIn PDF document text
    • http://sp3siemianowice.pl/userFiles/files/zidupid.pdfIn PDF document text
    • http://konemara.hu/userfiles/file/vudulefekujajijomi.pdfIn PDF document text
    • https://qnzar.com/files/josibe.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613655a59270b---varetenomosonujida.pdfIn PDF document text
    • http://anpo.vn/upload/files/23058652902.pdfIn PDF document text
    • https://ximatinhdongnai.com/app/webroot/files/images/pages/files/51358350604.pdfIn PDF document text
    • http://jingyitech.com/uploadfile/39089714003.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f841ec7145---kubevivigakelanutopov.pdfIn PDF document text
    • http://suachuadienlanhhoaphat.com/hinhanh_fckeditor/file/wagusewoto.pdfIn PDF document text
    • http://ohxto.com/uploaded_files/userfiles/files/jegiv.pdfIn PDF document text
    • https://careerroots.net/ckfinder/userfiles/files/81984636683.pdfIn PDF document text
    • http://idolyokocho.com/js/ckfinder/userfiles/files/dusovademakupab.pdfIn PDF document text
    • https://0955205219.jwa.tw/userfiles/files/14901514642.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_off0000d329.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD329 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB3B 17392 bytes
SHA-256: ae7f47fe6ca298be5a1810417fa139d7a16743ba7f27a7d7099268b928fcca5b
font_02_sfnt_off0001189c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1189C 11056 bytes
SHA-256: 5359a3e1e4c42136bcdf2d7fff2ae7dbd384cebf8c7972f5ea17065ef0a61243

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