Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7c83c865527b120…

MALICIOUS

PDF

78.6 KB Created: 2021-09-17 11:20:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8ca5eef01f45375dcf894a27cf23b12b SHA-1: 1c010a5d4e31d1edf0564c1566b6fe7733edf4e6 SHA-256: a7c83c865527b1203933b0c0d392c384ccd1a48a7cff3c4ee4393245276a2797
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to domains hosting other PDF files, indicating a link farm or distribution network. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic specifically flags this behavior. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://xn--o39a91gvwm83kbsn.net/FileData/ckfinder/files/20210915_45296F83B0983BAB.pdf In PDF document text
    • http://ingmontagna.com/userfiles/files/vixet.pdfIn PDF document text
    • http://hanabi-la.com/uploads/files/fefavad.pdfIn PDF document text
    • https://imihwa.com/uploads/image/20210908/files/20210908102533.pdfIn PDF document text
    • http://gocreate.termall.pl/upload/fck/file/relunibenel.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16140e4ffc7a9e---65487031940.pdfIn PDF document text
    • https://glamweddingdesign.com/userfiles/file/nunet.pdfIn PDF document text
    • https://justforjetscatering.com/userfiles/image/files/95257751488.pdfIn PDF document text
    • http://iranjobex.com/cache/fck_files/file/61635782781.pdfIn PDF document text
    • http://petraifevronii.ru/ckfinder/userfiles/files/49130669435.pdfIn PDF document text
    • https://jkmart.net/FCKFiles/File/83776674196.pdfIn PDF document text
    • https://supermagnum-bg.com/ckfinder/userfiles/files/nepiladirigiva.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/f1svve6ci3kgsfvdo1975pfmk6/47816117621.pdfIn PDF document text
    • http://big-blue-bus.com/pics/fotos/1/file/88513440790.pdfIn PDF document text
    • http://sinoscaform.com/upload/ckimg/files/202109041401002980.pdfIn PDF document text
    • https://seikai.jp/free_images/files/56438137126.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/tewodafugezejofake.pdfIn PDF document text
    • http://bretagne.annuaire-regional.com/ckfinder/userfiles/files/62826401169.pdfIn PDF document text
    • https://safarekhoob.ir/basefile/safarekhoobir/files/fifete.pdfIn PDF document text
    • http://gaudi.tw/upload/files/15627908715.pdfIn PDF document text
    • http://retailcop.ca/files/76904197871.pdfIn PDF document text
    • https://bodegoncriollo.com/userfiles/file/relesomewazebex.pdfIn PDF document text
    • https://theloneranger.tv/clients/loneranger/ckfinder/userfiles/files/faxobuxetaf.pdfIn PDF document text
    • http://xn--54-dlcdkamdj4btild5b.xn--p1ai/ckfinder/userfiles/files/13149748676.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=mononoke+anime+onlinePDF 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_off0000d1f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1F9 9988 bytes
SHA-256: 7eda7f2a7c5f4980346da25f4343f9cdf5a0baac858a2feb16718e302a0f6eb5
font_01_sfnt_off0000e80a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE80A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001001c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1001C 17400 bytes
SHA-256: bb6dcffe5673d74446759becd159b14776c079525ed04a91e6f37796dc5953a4

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