Malicious PDF — malware analysis report

Static analysis result for SHA-256 290c73b057dcc5e8…

MALICIOUS

PDF

82.0 KB Created: 2021-09-20 16:56:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a4f9782db9ae11be6622fac00eafca65 SHA-1: ae80b307cf346f73da3babedcfbe1673eccf80fe SHA-256: 290c73b057dcc5e830245a90aa008727356053ae3fbe923a58ca6136d15a14cd
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. The PDF contains numerous embedded URLs, with one specifically identified as a link farm on disposable hosting, suggesting a phishing or malware distribution lure. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/88174cc4cdfc26447d800584d0812a1f/65020439040.pdf
    • http://zekejozsef.eu/FCKfeltoltott/file/28796283064.pdf
    • http://sghr.ca/upload/ckfinder/files/fododijolig.pdf
    • http://air-ned.com/uploads/files/53942334306.pdf
    • https://yantrasearch.com/ckfinder/userfiles/files/19905687739.pdf
    • http://wedooverseas.com/userfiles/file/denukopanamunigi.pdf
    • https://sainaudit.mn/File/44263943820.pdf
    • http://slsnn.ru/content/files/lusedaninas.pdf
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/jj1f08895i2i9k9btce6kmt3ae/bamizusupidoziwekaf.pdf
    • https://duproject.com/uploadEditor/files/92324341294.pdf
    • http://edisonprivateschoolbeta.com/cote_dor_import/admin/ckfinder/userfiles/files/40003776069.pdf
    • http://ciccioinpentola.com/userfiles/files/88200867803.pdf
    • https://distriparkbotlek.nl/userfiles/files/wukoripet.pdf
    • http://files.ibiza-ferien.de/file/40028313005.pdf
    • https://telliogluhukuk.com/userfiles/file/laxoriwe.pdf
    • http://hzxgdz.com/images/upload/File/36309519639.pdf
    • https://apra.pl/files/file/8765025266.pdf
    • https://tinhhoaxanh.vn/userfiles/file/89589578847.pdf
    • https://saint-florentin.charcutier-traiteur.fr/ckfinder/userfiles/files/4805295463.pdf
    • https://nnkcreations.com/userfiles/file/tisofegavivemifekutolegif.pdf
    • https://psychologgia.pl/Upload/file/13268804089.pdf
    • http://vonschickenconcord.com/uploads/files/43877253898.pdf
    • http://sun-green.de/ckfinder/userfiles/files/1782719220.pdf
    • https://ngusacdon.com/upload/files/gifovotofo.pdf
    • https://aquaprosmart.com/userfiles/files/ditidivasabad.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=batman+injustice+theme+apk+download
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d7c4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD7C4 16792 bytes
font_01_sfnt_off0000efdb.bin
eacebf7cdca6665938fe2f07ea64bb75a585426cf45ea4dd768248beaf00cc99
pdf-font-stream PDF embedded font (sfnt) at offset 0xEFDB 11140 bytes
font_02_sfnt_off000109b7.bin
a6b70cd1be14c62eb9cb848809777193dd429eb90f750ab2b678d7046c57d602
pdf-font-stream PDF embedded font (sfnt) at offset 0x109B7 18028 bytes