Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8ff6de117deb500…

MALICIOUS

PDF

72.6 KB Created: 2021-04-06 11:08:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 8dba4a2b09cfc686c6ae6ed73c48ef32 SHA-1: e7e3872dfdf9b9641a73ecc4cb44c95f7688b831 SHA-256: e8ff6de117deb50068a74fb4dcb91f919b93fa05132333b864dd6bad2c24e805
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a significant portion hosted on disposable domains, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded links are indicative of a malicious document, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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.
  • 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://baarspo.ru/strik?utm_term=infinite+campus+augusta+county PDF link annotation
    • http://findattime.com/49082903214h5y1t.pdfIn PDF document text
    • http://zovolexune.sportsontheweb.net/retawelufeseweju.pdfIn PDF document text
    • http://igbusinessabouthelp.com/what_are_the_5_theme_parks_at_disney_world11yza.pdfIn PDF document text
    • https://cdn.sqhk.co/rubekafux/NMBeMii/36879019940.pdfIn PDF document text
    • http://everydays.space/bahnschrift_condensed_bold_fonth6dpt.pdfIn PDF document text
    • http://sezejawi.mypressonline.com/camera_shots_angles_and_movement_lighting.pdfIn PDF document text
    • http://tepugorotewole.medianewsonline.com/77938529313.pdfIn PDF document text
    • http://potuxoposutu.medianewsonline.com/75461614435.pdfIn PDF document text
    • https://cdn.sqhk.co/bitajububida/ihLUiMb/ark_survival_evolved_mobile_apk_free.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cb2d4818-2134-4ea5-ae57-1bc45cfc4292.filesusr.com/ugd/7e787c_034129672887427dbb4f6d441c7c76fe.pdf?index=trueIn PDF document text
    • https://43cb2d18-1589-43a7-b1c5-fe1278e1c76d.filesusr.com/ugd/370b54_cdb6eed3e8d94b7b959c01158566be7d.pdf?index=trueIn PDF document text
    • https://7737876a-f762-42ef-af6f-18b78abacabf.filesusr.com/ugd/9066bd_69ce275b85a745ff8ea9da6b93a0f4dc.pdf?index=trueIn PDF document text
    • https://883cd1dc-02d0-4059-8fa2-99201f92b631.filesusr.com/ugd/6166c9_feab5e395fc24f3e9e88b3da04b7caa9.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a736bcb9-c6e2-44b4-bcd3-2a39b641c805/luruxifo.pdfIn PDF document text
    • https://234a0c07-d908-4261-bb83-16b3c96a9b04.filesusr.com/ugd/73e0e6_8ad61bb0bbb64a82b50fa7e15a961c10.pdf?index=trueIn PDF document text
    • https://559ef5b4-38f4-491c-95f5-a6f57f0534fb.filesusr.com/ugd/1b862a_35a00bbd27fe445bbaadeca889c155cc.pdf?index=trueIn PDF document text
    • https://cd9ed9ec-87d1-42be-9198-0b2de6c1db4d.filesusr.com/ugd/158fb9_34fcf35438bb4f5a8cef10bdb1286d9b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f43e7cf9-2d44-442f-9a78-f408dc6ceb37/color_de_la_leche_materna_los_primeros_dias.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dffd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFFD 5248 bytes
SHA-256: 24cd03712c65aa78186dbca2e3d3655cf8b52fb81dbc405c5b5fb5b23f4e38e7
font_01_sfnt_off0000f1db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1DB 10728 bytes
SHA-256: 04eaa8fd4c3d763e77362b5327f230c02cd165b5b938818203dd4b629bc59b28

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