Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0e68a0fb68994a0…

MALICIOUS

PDF

79.2 KB Created: 2021-03-15 07:42:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 725e57b7cc0e6e0a46128b35bbe5e16c SHA-1: e3aeb338e1e165fae1ab0af9984df56c0e4763f2 SHA-256: e0e68a0fb68994a01c5f8a3f5485cb6f7b2bc99570e3d6c5939c7c73585c6724
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are SEO-optimized and point to potentially malicious domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nipisod.ru/wix?keyword=the+book+of+symbols+taschen+pdf
    • https://cdn.sqhk.co/mifijizudi/ieohUjj/39395886754.pdf
    • https://cdn.sqhk.co/nesadatifu/zmv1tic/16730461783.pdf
    • https://cdn-cms.f-static.net/uploads/4477649/normal_60336e4b4727f.pdf
    • https://cdn.sqhk.co/jekidase/ie7zThg/kixapugupaveseredikogis.pdf
    • https://cdn.sqhk.co/ferudati/iidhjrs/kuvifuxuna.pdf
    • https://cdn.sqhk.co/gazejuruni/jajjgiX/line_free_calls_and_messages_apk.pdf
    • https://static.s123-cdn-static.com/uploads/4377704/normal_5fefde59026d4.pdf
    • https://cdn.sqhk.co/wifavizen/ibhcMMu/wuvezodizimelonelokoj.pdf
    • https://cdn.sqhk.co/gilikomow/hgohjfP/wrong_turn_movie_part_1.pdf
    • https://cdn-cms.f-static.net/uploads/4387061/normal_601dfad1accf4.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://3d3b31fc-6152-41c7-b1d4-a4af3afcce63.filesusr.com/ugd/3f8d85_512156d85b064400a3d3a4900effdf10.pdf?index=true
    • https://uploads.strikinglycdn.com/files/8bc86545-a861-449f-a146-9d66d66cadc7/the_immune_system_parham.pdf
    • https://uploads.strikinglycdn.com/files/6596151e-7d0f-4109-8865-0672f0f6d450/descriptive_essay_on_my_favourite_food_biryani.pdf
    • https://7162f0c1-3bb2-4775-9ad2-1e34613fb889.filesusr.com/ugd/595093_48e87bdf53684f10b9f85e2260f4b11d.pdf?index=true
    • https://uploads.strikinglycdn.com/files/e7130bce-22b5-44b0-a36b-d9a04a61789b/35830896984.pdf
    • https://5902ff30-e651-486c-ac37-3e8383bfa78f.filesusr.com/ugd/f35da0_e2225559782a46b39c653f67ef41e5ff.pdf?index=true
    • https://uploads.strikinglycdn.com/files/48da7677-b3eb-4fdc-9f6f-4bb09d346670/comentario_biblico_macarthur_apocalipsis.pdf
    • https://uploads.strikinglycdn.com/files/9438e66c-f3dc-49d1-b085-e8c0732a635c/20922804836.pdf
    • https://uploads.strikinglycdn.com/files/748a177e-addd-4ab4-bc9d-eac001acab64/natuvukevopigafulawa.pdf
    • 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_off0000ee6d.bin
c4c0243255dfddfabd914c3aa8676149f69ade0fe1e443b9769101007ecaeb87		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE6D 5556 bytes
font_01_sfnt_off0001012c.bin
1d18534733479c870a78c46a90b83ed8aff410c3511f6838c5b83347f92bfa48		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1012C 1964 bytes
font_02_sfnt_off00010a86.bin
e9b23ed2d7632e9836e42c2d6e06bd0cc2b881849d3ee7c1e5696af9d3abd352		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A86 10180 bytes

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