Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ffc059d74344281…

MALICIOUS

PDF

78.9 KB Created: 2021-03-17 02:14:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6db327cf75b615c542bea4583965eac1 SHA-1: d6e90c7349b5ea20edc2dd773b49bfa6566a00d0 SHA-256: 2ffc059d7434428152c5b8f77ded5fc6c99571ea43be9bb714b47465bc273ce0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ML classifiers and ClamAV, specifically identified as a phishing trojan. The PDF contains numerous embedded URLs pointing to disposable domains and link farms, suggesting an attempt to redirect users to malicious content. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a date, indicating it was likely generated programmatically to serve as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 https://nipisod.ru/award?keyword=brunella+gasperini+pdf
    • https://xibupitosuxusi.weebly.com/uploads/1/3/1/3/131380094/6955506.pdf
    • http://mamuzomilap.iblogger.org/88072520353.pdf
    • http://1fps.ru/zagg_folio_keyboard_case_ipad_mini_5f84iv.pdf
    • http://warupipujamoru.sportsontheweb.net/gulitinuxavemirije.pdf
    • http://techanomic.com/install_platform_toolset_v140_xpurkpm.pdf
    • https://lugijuvumefabi.weebly.com/uploads/1/3/4/7/134761930/7906561.pdf
    • http://pusosokus.iblogger.org/piano_sheet_music_free_advanced.pdf
    • http://wisemad.22web.org/98294324826.pdf
    • http://winovigamaj.mygamesonline.org/sazasalesidomagipe.pdf
    • https://sesoramin.weebly.com/uploads/1/3/2/6/132681885/ratosap-zibij-vejujunewelovas-nunez.pdf
    • https://wisamifogafize.weebly.com/uploads/1/3/4/5/134598642/bitufujube_mixemogiru_garogizajata_sitanemizer.pdf
    • https://wokogosomexar.weebly.com/uploads/1/3/5/3/135322546/jitajufozegup_jijemuxuvafufu.pdf
    • http://jusojixanona.getenjoyment.net/69639192632.pdf
    • https://jewadasin.weebly.com/uploads/1/3/4/6/134604584/fosidasogaw-zalaxupupinaz-retemoxox.pdf
    • https://gikemadisasov.weebly.com/uploads/1/3/4/6/134667176/varifobod_pejida.pdf
    • http://lulodexov.scienceontheweb.net/23206993665.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://gixiluvigatekij.atwebpages.com/85746844263.pdf
    • http://telatojewoka.epizy.com/parenofaxuxak.pdf
    • http://visugog.myartsonline.com/40450572187.pdf
    • http://kibagog.onlinewebshop.net/51704088023.pdf
    • http://fukuselumetu.myartsonline.com/94650344688.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://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e72c.bin
6c0899a7392896e5e3427f5aa9db1afbe5725191d19b040b0d8762f5acd58eed		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE72C 4948 bytes
font_01_sfnt_off0000f808.bin
a30526b373392c7ee8a5408da22b95649cbba0865f389e8fb60cc30dbee958e6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF808 12052 bytes
font_02_sfnt_off00011f1d.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11F1D 4324 bytes

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