Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f29dd04fcbe1a5e…

MALICIOUS

PDF

67.7 KB Created: 2021-09-25 14:42:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 73e068ad64f948dca0347570f7862af3 SHA-1: b08a50a3e3b20a65a50f27ceebee89593e953299 SHA-256: 2f29dd04fcbe1a5e494c24743d7e99e891983c52fa609e0b93a80e2b938b4470
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a phishing or malware distribution lure. It contains numerous embedded URLs pointing to various domains, suggesting it functions as a link farm to redirect users to potentially harmful content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically indicates a non-clustered link farm on disposable hosting, reinforcing the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://solar-makernavi.com/ckfinder/userfiles/files/74257176242.pdf
    • http://konberdbio.com/upload/files/13272851949.pdf
    • http://decentlogistics.pk/survey/userfiles/files/tubomigogaxofasixofup.pdf
    • https://efnnma.org/files/file/xoxopuruvifu.pdf
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/1612f9a1964c99---wutubawi.pdf
    • http://good163.cn/Uploadfiles/files/fajoxovugusopedudilololim.pdf
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/b1lbme32p5upqtbuvrsk27eqa6/28540393166.pdf
    • https://argumentua.com/i/file/bepuredewatej.pdf
    • http://cadeco.com/testingsites/advantage_aviation/assets/media/file/41723259873.pdf
    • http://xn--o39a91gvwm83kbsn.net/FileData/ckfinder/files/20210907_D500DDED0ED394EC.pdf
    • http://bowenlawmt.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/76057447157.pdf
    • http://master-vin.ru/files/file/palasakufozel.pdf
    • http://espokebar.com/uploads/files/2824786587.pdf
    • http://utpcomp.ru/uploads/files/sajarosezakem.pdf
    • https://dom-titan.rs/files/49192096786.pdf
    • http://motovelo-nmsk.ru/userfiles/file/debezomuwixo.pdf
    • http://wjcopy.com/upload/files/xamudejiroxajazenova.pdf
    • http://raegcafe.com/uploads/files/selokinodizozafexibeloban.pdf
    • http://bikipvuikhoedep.com/app/webroot/files/editor_upload/files/kejipavixasamexif.pdf
    • http://prmakeup.com/Image/files/24605175711.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=how+to+use+wifi+master+to+hack+wifi
    • 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_off0000aa13.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAA13 16792 bytes
font_01_sfnt_off0000c225.bin
51aa7239996cdcbfbf2ccd0a055da62db6fd8b6d75e533bec14199b3c41a41a4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC225 15428 bytes
font_02_sfnt_off0000e8e7.bin
b6bcd4f0dfb6cad27b2527f918b0f0a700f3e7b2a48d1c607d667219e94a90fc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE8E7 10720 bytes

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