Malicious PDF — malware analysis report

Static analysis result for SHA-256 7eaa4e3d2fec1d5e…

MALICIOUS

PDF

86.3 KB Created: 2021-09-11 13:17:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 958a61bb06c1fa723c4ae9f143d7138d SHA-1: 4f73bfe583d4ff379dfcd40cec9890cb68a2be12 SHA-256: 7eaa4e3d2fec1d5e3fad7d3c95688f2a63cb5fe6db1a7b488a75aac8fd9c6815
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. It contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically points to this behavior, suggesting the PDF is used to distribute traffic to various malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://oniceh.ru/uplcv?utm_term=surround+music+player+for+android
    • http://mrukseo.pl/userfiles/file/wadukafuxikefeduza.pdf
    • https://chiuman-hk.com/images/file/dakafetimojimowuwu.pdf
    • https://whiteplacard.com/UserFiles/file/lofofuzogodivuzuzetu.pdf
    • http://a-daily.jp/app/webroot/contents_img/files/jikopakolepa.pdf
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/161305494ef983---wasaginubegasij.pdf
    • https://quasar.mago.ro/ckfinder/userfiles/files/3943133552.pdf
    • http://ttworld.hu/uploads/content_files/files/nitemekugurobarazovinuma.pdf
    • https://alpinebadmintonacademy.com/ckfinder/userfiles/files/68736335072.pdf
    • http://studioaba.net/userfiles/files/31965648664.pdf
    • https://terracetemayonetim.com/upload/ckfinder/files/81274133451.pdf
    • https://rotterdampools.com/contents/files/74874812852.pdf
    • https://appvid.eus/userfiles/files/69357496719.pdf
    • http://www.asap-recruitment.net/upload/file/firafovu.pdf
    • http://stlnsk.ru/uploads/file/putugudixow.pdf
    • http://ortopediaszombathely.hu/editor_up/wujazavepolewakuza.pdf
    • https://www.pactforfamilies.org/ckfinder/userfiles/files/ponup.pdf
    • https://lideregitimpaketleri.com/calisma2/files/uploads/72952948552.pdf
    • https://techlan.pl/files/file/tubixomedofevidegadalowe.pdf
    • http://nhakhoasaigonkimcuong.com/uploads/images/files/lumukeniwa.pdf
    • http://ciba.lv/uploaded/file/lovitevuda.pdf
    • https://hasekei.jp/userfiles/file/8188308953.pdf
    • https://bio86.net/userfiles/fichiers/76108111212.pdf
    • 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_off0000e4b8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE4B8 16792 bytes
font_01_sfnt_off0000fcca.bin
1148c0ee032b31c727c6f95206fbff722dad45c0b130088d69c5380a1bc932c8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFCCA 20384 bytes
font_02_sfnt_off0001327d.bin
01bea174acffe0525df50b37b51d05b0be6359da8a4973743a8e445fa3e4c548		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1327D 10972 bytes

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