Malicious PDF — malware analysis report

Static analysis result for SHA-256 99034e5a713a5ff9…

MALICIOUS

PDF

74.3 KB Created: 2021-09-18 04:35:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cd259b2be7f80390cbe3692e7fc52fcd SHA-1: a7d07f9b4650464b7c3ec79b6234a5e2809c9818 SHA-256: 99034e5a713a5ff9f7b7431375126b45bba45fe2ccdf21d1671898a2edb45bd3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to a link farm, a common tactic for phishing or distributing further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the structure and URL patterns suggest a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://teakdeck.pl/files/file/rusutafotolamegorozagisez.pdf
    • http://naasschoolofmotoring.com/fckeditor/userfiles/file/fozogoderoxan.pdf
    • http://eko-uklid.com/files/file/4075823769.pdf
    • http://nedvizhimost-v-sharm-el-sheikhe.ru/uploads/files/xefadabetuvagazilugaxaru.pdf
    • https://gymlesgeants.com/upload/editor/file/68750182779.pdf
    • https://datenglagi.com/contents/files/jezirenojezeza.pdf
    • http://nut-shell.net/upload/files/2729962777.pdf
    • http://99hospitalitygroup.com/ckfinder/userfiles/files/83753655832.pdf
    • http://mcutech.net/upload/2021/09/file/1631480475491580490.pdf
    • http://asqcert.net/files/files/99041792439.pdf
    • https://termokingbt.com/ckfinder/userfiles/files/71922251733.pdf
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/28991a073eecc1a295d399285c17196f/tofuliripawetesalot.pdf
    • https://telewebmarketing.com/FCKeditor/file/sogesojilililokubazivomel.pdf
    • https://10kshot.com/customerinterview/ckfinder/userfiles/files/gelidufoxekejabixivigujef.pdf
    • https://carrieres-pierre.com/userfiles/file/35938954282.pdf
    • http://bakersfield.thepokeluau.com/uploads/files/gulawerevepezadepidutas.pdf
    • https://xn--90aoja6ahg5ds.xn--p1ai/uploads/files/17323945115.pdf
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/2cb7b53ee5461decbe03b003d93c7b4b/bowamopibi.pdf
    • http://jedzenie365.pl/ckfinder/userfiles/files/90429235600.pdf
    • https://qualitygums.com/userfiles/file/petuxuluxujopes.pdf
    • http://sd-admin.fazendapenaazul.com/ckeditor/uploads/files/vuxonomojeb.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=android+app+for+samsung+smart+tv
    • 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_off0000c183.bin
6a2d35c2707286394d68177725174574a11d7df8c0b22ed302c5702d69f024e4
pdf-font-stream PDF embedded font (sfnt) at offset 0xC183 16108 bytes
font_01_sfnt_off0000eaca.bin
6fb19a72a2d7831f8f9ef9dae7158cace1daccbe9a1158e513fc85b48f23d5aa
pdf-font-stream PDF embedded font (sfnt) at offset 0xEACA 10808 bytes
font_02_sfnt_off00010387.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10387 16792 bytes