Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f2318110fe2408d…

MALICIOUS

PDF

81.5 KB Created: 2021-09-19 00:21:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4bbc644f427605ba2dbc42cb1a326e5e SHA-1: b878e3a0209a5780879796c72b3420d3bc8d0db4 SHA-256: 4f2318110fe2408de91ae667ceaea53aac0fb1aa1d7776f23fd5c2d4b5d293b0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to disposable hosting, suggesting a link farm or phishing lure. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM specifically flags this behavior, and the presence of external URIs further supports this. No scripts were extracted, but the overall structure and URL distribution strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://medvor.ru/uplcv?utm_term=how+to+limit+wifi+data+usage+on+android
    • http://khachsandomino.com/hinhanh_fckeditor/file/fewatasemuwana.pdf
    • http://nwatchonline.org/userfiles/file/mamonabiguzazurebiwixam.pdf
    • https://gemicilojistik.com/userfiles/upload/file/63492442463.pdf
    • http://sk-uralstroy.ru/uploads/files/vumubevatafivedu.pdf
    • http://iuoooo.com/filespath/files/20210905175708.pdf
    • http://uniroll.pl/user_images/file/65716271087.pdf
    • https://stopserv.ru/files/file/17227548596.pdf
    • https://acp-luxusingatlanok.hu/ckfinder/userfiles/files/26222652190.pdf
    • https://myparrotfood.com/user_files/files/ronomumudafegabozobo.pdf
    • https://kampusogrenciyurdu.com/file/towetune.pdf
    • https://jordanadams.com/ckfinder/userfiles/files/xevavudetujakunonet.pdf
    • https://vhssirimpanam.org/ckfinder/userfiles/files/19365355251.pdf
    • http://guoyangmoju.com/userfiles/files/pikesutagurasekerujesomu.pdf
    • http://work4shop.cz/userfiles/file/kajoxuxativasani.pdf
    • http://kaushalacademy.org/ckfinder/userfiles/files/nivuboxonogane.pdf
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/161408ff91fd7f---malusakimijizixu.pdf
    • http://www.chiringuitomediterraneo.com/ckfinder/userfiles/files/18958706155.pdf
    • http://nawooelcs.com/upload/userfiles/2021/09/files/210918174457.pdf
    • https://akilanews.com/ckfinder/userfiles/files/nobemipi.pdf
    • https://christianschoch.ch/userfiles/file/rilutezapoxidafu.pdf
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141316f903a1---16954058322.pdf
    • https://niboparis.com/upload/fckeditor/file/1630763593_1.pdf
    • https://ceylanotel.com/firma/files/vexivaxiv.pdf
    • https://torbay.ru/images/uploads/file/kiwofetozen.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_off0000d8f3.bin
a87d4383f28d02dee3c6334662234a15e1dbf810596a20eaee3bdb72fdbf75aa		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD8F3 17792 bytes
font_01_sfnt_off000106d3.bin
938dc1eab6cf9265f98e783faab1a242105c189ed470db76fb956d43d85a17de		 pdf-font-stream PDF embedded font (sfnt) at offset 0x106D3 10876 bytes
font_02_sfnt_off00011fbb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11FBB 16792 bytes

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