Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a03d3a90df22a97…

MALICIOUS

PDF

79.6 KB Created: 2021-03-07 17:53:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: febf8fdc18e4d82d8de929b769dd5cd2 SHA-1: a2551b4359cb8fa86129a1c134e0a38c8f72a958 SHA-256: 2a03d3a90df22a973af76948d93940db60ab791e5b596d134b1a53adc5de05c7
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by multiple heuristics, including ClamAV and an ML classifier, and contains a large number of embedded external links, suggesting a link farm or phishing attempt. The document body, though heavily obfuscated, contains references to 'Perry Mason fanfiction' and the wkhtmltopdf tool, likely as a lure. The presence of numerous external URLs, including suspicious domains like 'seumenha.ru' and 'lnstagram-blue-ticks.com', indicates an attempt to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://seumenha.ru/wix?keyword=perry+mason+fanfiction
    • http://lnstagram-blue-ticks.com/29887023291kp3d8.pdf
    • https://tudaluvakagovax.weebly.com/uploads/1/3/4/6/134614365/pidewinagitet.pdf
    • https://cdn-cms.f-static.net/uploads/4455884/normal_603d700e17468.pdf
    • https://cdn-cms.f-static.net/uploads/4454543/normal_601a40a49c62d.pdf
    • http://matteset-spon.space/best_photos_editor_app_for_android61r31.pdf
    • https://cdn.sqhk.co/vovewotutal/fGijMji/plants_vs_zombies_2_free_download.pdf
    • https://movadopudi.weebly.com/uploads/1/3/0/9/130969115/7c9f8f9715795.pdf
    • https://cdn.sqhk.co/xejudawadoni/gdcii58/nature_sounds_birds_download.pdf
    • https://somotudodij.weebly.com/uploads/1/3/4/6/134699902/1635396.pdf
    • http://fitness1.space/17193047946w3o86.pdf
    • http://copyright-helps-team.com/harry_potter_and_the_order_of_the_phoenix_game_mac_downloadzk9p0.pdf
    • https://nomuwasu.weebly.com/uploads/1/3/3/9/133997615/85ac7fb0969a5c.pdf
    • https://cdn.sqhk.co/goluxewimabu/gdifjgX/84374759207.pdf
    • https://ranekiwoj.weebly.com/uploads/1/3/0/8/130814960/xubarerom_kekatar_tirefere.pdf
    • https://cdn-cms.f-static.net/uploads/4501991/normal_5fd71b0380e4e.pdf
    • http://uplrezina.site/how_to_know_when_airsoft_battery_is_chargedoa7bl.pdf
    • https://cdn.sqhk.co/soziwariru/4jcgeia/92125043445.pdf
    • https://cdn.sqhk.co/numexerab/fig5jih/wowusofijotupamupit.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://99470c7d-c692-4648-a7b8-36ea19db2883.filesusr.com/ugd/ab059d_1e8da3d3a52d452da40d47f2b7073798.pdf?index=true
    • https://e02212b7-c8ec-4bf5-ba3e-d68a1de675e0.filesusr.com/ugd/7f1d73_f946472a6f344258b254b83792749e26.pdf?index=true
    • https://204833c8-abda-4421-8777-5048ee7dd919.filesusr.com/ugd/e30b7a_2e82c9e55b9c4c0f892db6cf8894cf4e.pdf?index=true
    • https://e0a971b2-7104-4718-9e5f-4f17d768618f.filesusr.com/ugd/6d43b6_ad18a5fc23bb4cbb813012467e11e2d6.pdf?index=true
    • https://73856814-13bb-4d44-aeaf-752cce6ba6bd.filesusr.com/ugd/a0d21a_c9d552303da74f1c91169793491d504c.pdf?index=true
    • https://61df3396-90b5-4b69-a3ae-475c9da6ebc5.filesusr.com/ugd/516574_4f513b9575a34a5590fc81e15bbabdbb.pdf?index=true
    • https://6cbe2f5c-748b-4bc6-b691-25a968a47885.filesusr.com/ugd/d6b5da_583f4949386d49d7b4642ea0a4fe219b.pdf?index=true
    • https://e055bcc9-c4f1-4c6c-8dcb-0912bf54750f.filesusr.com/ugd/b4a829_d32337ad31b044f1bc9ce75639062df9.pdf?index=true
    • https://535a9070-e28a-464b-adc5-c02ad08be00b.filesusr.com/ugd/9df9d6_f5a1b10ca79d4582925ad0d755d3fcfd.pdf?index=true
    • 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fbc5.bin
d0bcde895b4f0773ac7cae16053f50beccc0224b4b3c71aea2321be64bd1a65e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFBC5 5096 bytes
font_01_sfnt_off00010d09.bin
a0806e23e355c40295156551fe70ff8828b08e95d1e198ed30c01b96c93d7ae7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10D09 10428 bytes

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