Malicious PDF — malware analysis report

Static analysis result for SHA-256 354f61da8c898605…

MALICIOUS

PDF

170.4 KB Created: 2021-03-22 07:13:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 831e2ce80c358e36be774891d58bbd63 SHA-1: 26380479bfc19c4e52643a47175f8c7a8e9de4e8 SHA-256: 354f61da8c898605d0db3a48210d5f9ed603919748103a68fc00e7f6e17a5c2d
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with at least one, 'https://xajibur.ru/award?keyword=bwv+147+piano+pdf', identified as a potential lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for link farms, further suggesting a phishing or malware distribution scheme. No scripts were extracted, but the overall structure and URL analysis point to a phishing attempt disguised as a document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://xajibur.ru/award?keyword=bwv+147+piano+pdf PDF link annotation
    • http://mekomob.getenjoyment.net/79212552026.pdfIn PDF document text
    • http://kalowodopole.mygamesonline.org/20040869826.pdfIn PDF document text
    • http://novijixonusasu.mywebcommunity.org/bhaktisiddhanta_sarasvati_books.pdfIn PDF document text
    • http://webpost.pro/stick_ranger_2_wiki7t24s.pdfIn PDF document text
    • http://electorat.org/fl_studio_12_old_version_free_downloadfb7ju.pdfIn PDF document text
    • http://valigulepi.scienceontheweb.net/27960974489.pdfIn PDF document text
    • http://fruit-citrus.space/66821423974u2izy.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/de9b93ac-5ed9-48af-a84b-3126ab68fc89/hp_laserjet_1320_printer_driver_download_windows_10.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a336fbc-6691-4ea2-8c05-767ab77f2ad0/how_many_polar_bears_are_endangered.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/444fbec9-ae58-424f-b6c6-41dfc8d18ae7/difisiliziwebog.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b2b5e4d5-1c32-49c1-97a7-51e08005d838/donkey_on_the_road_again_meme.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/72dcb03a-54d7-4d93-828c-ee8ce0150a22/casio_ctk_496_price_in_sri_lanka.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/13f95908-5d95-4d37-ba3d-952d1354555c/how_to_install_samsung_27_stacking_kit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/69c3df67-c5ca-42c1-9eb7-6449542e7d84/18576190082.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3915a3df-ee08-4c57-b8b8-5647a592a05e/75026085947.pdfIn PDF document text
    • http://wilaroxu.atwebpages.com/70492589597.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be9dd6d3-436f-4238-a4fb-c3f505218464/95273591736.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f61de6a-b720-40a7-85c5-d1991d254dae/what_is_the_best_free_personality_test.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c4d16be-fce3-485d-82ae-fd1de41dd175/81465562069.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/57de3e59-f575-47d6-909e-2ecfbba216d0/suxuku.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/75100a77-bb4c-4632-9da5-f6ad445528d6/tascam_dr_5_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8398c48e-8202-4b8a-9568-8e461d9423e9/kawibonumubuxosizileduvew.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ecb21c5f-9947-4e57-9aac-a2448772d251/vuvegujov.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00024b47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x24B47 5148 bytes
SHA-256: 6b84c286cf111fb7cf008624fa9d44794422473fed142363954b7ea6a679618f
font_01_sfnt_off00025d11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x25D11 13548 bytes
SHA-256: deaffa626d0f7b148f8a3f86385ebd0e6b275efc0389d500fd2b3862bef74722
font_02_sfnt_off0002879f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2879F 16120 bytes
SHA-256: 2cfc97915d250804213c9b0e6ad261e0979cd38371fb36ec9174dea58a153a3e

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