Malicious PDF — malware analysis report

Static analysis result for SHA-256 e920d7d4dfe00436…

MALICIOUS

PDF

72.7 KB Created: 2021-09-27 05:45:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 215ae6ea95f3ae480cea3ca672bb8183 SHA-1: 8640fb9e3ec941e58f803709bcf8093bed38fdc1 SHA-256: e920d7d4dfe00436ff8651aa0ececa0d9ea82613c83ef75333d2337cb9717723
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to suspicious domains and are flagged as part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://naucharts.com/ckfinder/userfiles/files/36192288302.pdf In PDF document text
    • https://elpollopaulino.com/cenavarra_userfiles/files/nirepepalalaxe.pdfIn PDF document text
    • https://yoimart.com/upload/file/20210921165419.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136fcb57905f---21952461969.pdfIn PDF document text
    • http://royal-pizza.eu/files/file/vefasomevidimavaw.pdfIn PDF document text
    • http://studioingegneriavaragnolo.com/userfiles/files/sefodowiwugazekaduwi.pdfIn PDF document text
    • http://saint-party.com/media/file/zawadusoxuwitipufipoxun.pdfIn PDF document text
    • https://blokhol.com/upload/files/10597533316.pdfIn PDF document text
    • http://nfc.soo.jp/file/5685092719.pdfIn PDF document text
    • https://laughteronlineuniversity.com/images/upload/files/81540149765.pdfIn PDF document text
    • http://deleersnijder-bocaege.be/images/file/8900364243.pdfIn PDF document text
    • https://amt-alarmy.pl/userfiles/file/pozijuvamemitefojebowonad.pdfIn PDF document text
    • http://baozhaopharma.com/upload/files/24693755166.pdfIn PDF document text
    • https://www.agcontraincendios.es/ckfinder/userfiles/files/ribikor.pdfIn PDF document text
    • https://bwhe.in/ckfinder/userfiles/files/51944594278.pdfIn PDF document text
    • http://vetcasatenovo.it/userfiles/files/vetojoruvipunelekulu.pdfIn PDF document text
    • http://donghozibistore.com/luutru/files/38836207537.pdfIn PDF document text
    • http://arcomproltd.com/userfiles/file/geninuzewejiwavobafim.pdfIn PDF document text
    • http://ecogestval.com/userfiles/file/punoxizexiwijezago.pdfIn PDF document text
    • http://agro-partner.com/Image/files/jazumifitutaxuwebanen.pdfIn PDF document text
    • http://www.nena-artspace.com/ckfinder/userfiles/files/22366657391.pdfIn PDF document text
    • http://emilygrilltogo.com/uploads/files/gavojaxixoziwakuvef.pdfIn PDF document text
    • http://optimaglobal.net/ckupload/files/3189820630.pdfIn PDF document text
    • http://outspokenholland.com/userfiles/fckFile/20210914133848.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=follow+up+email+after+submitting+resumePDF link annotation
    • 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_off0000b551.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB551 11004 bytes
SHA-256: 64782b15a7a7149a4225256bbdad3c29e536abe3fc0d992d087e68aa99c77eb2
font_01_sfnt_off0000ceaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEAF 17792 bytes
SHA-256: c80b8b1035732c803ecc05e069c80d71ee67b41ab2b59487e6a8a03c6f7e4383
font_02_sfnt_off0000fce8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCE8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1