Malicious PDF — malware analysis report

Static analysis result for SHA-256 9af791ef366a223a…

MALICIOUS

PDF

80.0 KB Created: 2021-03-22 12:54:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7e43677a26347b9c756e777d85e26790 SHA-1: 88be6671b61a1acf4ff9b850eff367d095ec0f4f SHA-256: 9af791ef366a223a1dd2477a666963717a08403072b2c6fe3ba8300e319cadfa
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a large number of external links, many pointing to PDF files hosted on various domains, suggesting a link farm or redirection mechanism. The presence of embedded URLs and the heuristic 'PDF_SEO_LINK_FARM' indicate that the document is designed to drive traffic to these external sites, likely for phishing or to serve further malicious content. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://pelibifir.ru/123?utm_term=alberta+education+extranet+student+information
    • https://cdn.sqhk.co/silijebutu/jfyYgh2/fafifulagar.pdf
    • https://geregilewupune.weebly.com/uploads/1/3/4/8/134849809/6349111.pdf
    • http://mumijivamivaxij.medianewsonline.com/68881201717.pdf
    • https://cdn.sqhk.co/nugizape/hbGdx82/45928557249.pdf
    • https://lulaxifijugom.weebly.com/uploads/1/3/0/7/130776747/4614541.pdf
    • https://cdn.sqhk.co/vuzujugasije/igjWghd/chicken_run_characters_names_and_pictures.pdf
    • https://static.s123-cdn-static.com/uploads/4445544/normal_5fdf32639bd06.pdf
    • http://idclick.cash/how_to_change_the_aperture_on_a_nikon_d5100on89p.pdf
    • https://cdn.sqhk.co/gusiloxi/iclYofj/superdry_ski_jacket_womens_uk.pdf
    • https://cdn-cms.f-static.net/uploads/4403565/normal_6042ab331b521.pdf
    • https://cdn-cms.f-static.net/uploads/4416139/normal_60186c53424f6.pdf
    • http://mekomob.getenjoyment.net/gijivegutavuxejopes.pdf
    • https://karoxenerom.weebly.com/uploads/1/3/0/7/130739074/mexofub_dasubo_sawukokenosuw.pdf
    • http://xepidenad.scienceontheweb.net/d_d_3._5_artificer_handbook.pdf
    • https://static.s123-cdn-static.com/uploads/4408584/normal_5fcc08f7a3163.pdf
    • https://cdn.sqhk.co/febowozefu/sWVhgQU/7937266338.pdf
    • https://cdn.sqhk.co/levuzivanu/hhdmqRv/fidget_spinner_magnet_science_project.pdf
    • https://cdn-cms.f-static.net/uploads/4499283/normal_5fdba9c1d53bd.pdf
    • http://istlan.space/194910339798k1fr.pdf
    • http://muldwych.com/all_information_about_cricket_game2k8wk.pdf
    • https://cdn.sqhk.co/dugixikisim/fgdiiic/you_are_the_reason_chords_piano_easy.pdf
    • https://cdn.sqhk.co/lafuwexale/jeioid7/synchrony_amazon_mailing_address.pdf
    • https://beluloxepivizor.weebly.com/uploads/1/3/4/1/134131295/0c5a3f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • 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_off0000eb64.bin
9ba597f807904227778f9cec6460a328405b08229afd6f701f25522428ccb2ff
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB64 5244 bytes
font_01_sfnt_off0000fd10.bin
2935a61336d50a09477027da8b14c2f61c35ece988426b6ee9a93612eb362c1e
pdf-font-stream PDF embedded font (sfnt) at offset 0xFD10 12524 bytes
font_02_sfnt_off00012459.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361
pdf-font-stream PDF embedded font (sfnt) at offset 0x12459 4324 bytes