Malicious PDF — malware analysis report

Static analysis result for SHA-256 df67b1046ed636ce…

MALICIOUS

PDF

86.9 KB Created: 2021-03-26 14:06:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: d959ede248b778bbed6882c4541bb0b0 SHA-1: f2d67330a1b7cc8ed1b8bc7602b0eecc579a0d98 SHA-256: df67b1046ed636ce4ca255b479be09e1451fc64474b1baffb7cf7a10e5a2c914
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, indicating a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to direct users to further malicious content or phishing sites. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed for initial access via phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://resalured.ru/award?keyword=letter+practice+worksheets+for+kindergarten+pdf PDF link annotation
    • https://cdn.sqhk.co/luzigagoguna/0hrpvhf/nedefix.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372354/normal_6008c3a0b79f2.pdfIn PDF document text
    • http://wegaturagifo.getenjoyment.net/jowemisukit.pdfIn PDF document text
    • http://usechambre.xyz/23292769979gzgi7.pdfIn PDF document text
    • https://cdn.sqhk.co/fopujetoros/ijZtgf1/68603338170.pdfIn PDF document text
    • http://fitit.space/rujabivozurifuktn47d.pdfIn PDF document text
    • https://cdn.sqhk.co/vedasukuki/jbAQZoI/xurajoz.pdfIn PDF document text
    • https://cdn.sqhk.co/tonukabonuwe/Kgijbgd/rovivozafexek.pdfIn PDF document text
    • http://pemufosapakem.mypressonline.com/why_is_my_computer_not_recognizing_my_mp3_player.pdfIn PDF document text
    • https://cdn.sqhk.co/sudizatase/idxAic0/kegenanubabupenexijemuk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4472185/normal_5fdd0bf49c8eb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rosajeku.myartsonline.com/71453367966.pdfIn PDF document text
    • https://0b21792c-a699-4cf4-8833-5910c6ad58af.filesusr.com/ugd/b0b521_9595fe523c894d3fb08becf8826d9935.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/werowibovezoje/how_to_watch_star_wars_clone_wars_in_chronological_order.pdfIn PDF document text
    • https://c809e8a6-5bdf-489d-8d8c-df4e4638a115.filesusr.com/ugd/45a296_0a58a404f4e140e887c3d4b4adddca05.pdf?index=trueIn PDF document text
    • http://pulutugorivexek.atwebpages.com/think_of_me_lyrics_veronicas_meaning.pdfIn PDF document text
    • https://s3.amazonaws.com/vexosafugunu/jikidov.pdfIn PDF document text
    • https://s3.amazonaws.com/votuweroxigezog/fujomiba.pdfIn PDF document text
    • https://f238abdf-92e3-4651-90df-65b6e8a648d9.filesusr.com/ugd/99965f_18125f706fc9473d860bcd0b6b2d7c42.pdf?index=trueIn PDF document text
    • http://xowobovu.myartsonline.com/calcutta_metro_map.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000104cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104CC 3396 bytes
SHA-256: 30501d06d88b2dddfd3e0bb265e791353b68d0d1f9949601d8098928c07db554
font_01_sfnt_off000110dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110DC 5480 bytes
SHA-256: b97e0170aaef080cd5b712c720ad834ca7f042ad99c7d55185ce9582839b5bcb
font_02_sfnt_off00012398.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12398 12228 bytes
SHA-256: 305d32ec5da18ab8ff8fc10b0448d59d3fa3990d1d17b21753ebb72e836d0b09

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