Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7ae2855a5728f17…

MALICIOUS

PDF

76.3 KB Created: 2021-03-24 10:02:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: e5d2cbd04a3a5b2f0abcabe96b674a46 SHA-1: 51b557e70afe914c93e4dc639c5eec43feae6a7d SHA-256: f7ae2855a5728f17437f69eb10230a46e48f75dd30447b589e9a47aeccb49118
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://zajinet.ru/wix?keyword=demon+eye+farm+terraria PDF link annotation
    • http://kijejakedaje.22web.org/adding_and_subtracting_fractions_with_unlike_denominators_printable_games.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418791/normal_604469dbae2a3.pdfIn PDF document text
    • http://chemistryplus.space/9570541028335jz8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461495/normal_6035fb81cf50c.pdfIn PDF document text
    • http://stroymarketmetal.ru/the_barbell_prescription_download7kbih.pdfIn PDF document text
    • http://pimebujeben.66ghz.com/besadigaduxurilitikezi.pdfIn PDF document text
    • http://lemakomude.sportsontheweb.net/sevinasupazo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460950/normal_6045f0c4593ac.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374359/normal_6005be9267b27.pdfIn PDF document text
    • http://usacreditmonitoring.info/tagurmxpak.pdfIn PDF document text
    • http://simcars.ru/48050324144qg2yh.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/dutuzanob/nursery_rhyme_lyrics.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f9b885c-ec68-4e52-9ace-2bc10e6c9817/how_to_scan_for_premarket_gappers_thinkorswim.pdfIn PDF document text
    • https://s3.amazonaws.com/nemafu/kimoxiginiwedizefewe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c380894e-0207-4ef5-b995-c0f5f863fa31/fisadenorezubuluk.pdfIn PDF document text
    • https://s3.amazonaws.com/zuponefi/b._phil_full_form.pdfIn PDF document text
    • http://liraperuwuw.atwebpages.com/g-shock_gravitymaster_ga_1000-4a.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_off0000d9fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9FC 4804 bytes
SHA-256: bce457dd629faa6575cef48a95cad2875c800a2b79157145b5df57e11e6e7efb
font_01_sfnt_off0000ea4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA4D 10692 bytes
SHA-256: 3d9abcd3e93e0b61f1baa61d1151db3385c7fb50edc1a67b61211b8d833a8949
font_02_sfnt_off00010f38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F38 16124 bytes
SHA-256: 4220fd49e02d582d9e9007acf89e2d27f86e37d22e90914109c77e0529a51ac6