Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb2cbd7365ae75bb…

MALICIOUS

PDF

82.6 KB Created: 2021-03-15 00:37:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 457ad73360e1ca521f0188f9d1431bbb SHA-1: 4987d84194a7f3b3ae2e7d052c014054f6d0553f SHA-256: cb2cbd7365ae75bb9910079c9cf9959b84d8ef9de21a71e9cc4ea87138db2820
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, a common tactic for phishing or distributing further malware. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of links, suggesting a malicious intent to redirect users. ClamAV detection as 'Pdf.Phishing.Trojan' further supports the malicious classification. No scripts were extracted, but the presence of embedded URLs points to a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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://seumenha.ru/wix?keyword=first+grade+social+studies+unit+plan
    • https://cdn-cms.f-static.net/uploads/4388818/normal_5fd914764d473.pdf
    • https://cdn.sqhk.co/jifibipex/BTjfibE/wowumopoxixarerolegexo.pdf
    • https://cdn.sqhk.co/gagupedoxut/3jgEjc0/62208766091.pdf
    • https://cdn.sqhk.co/fovomesit/Hoaibje/92955625325.pdf
    • http://siwupojotuj.getenjoyment.net/billy_goats_gruff_book.pdf
    • https://nifisutabunus.weebly.com/uploads/1/3/4/6/134634245/sabilanu_famati_xusoxo_tumamodos.pdf
    • https://cdn.sqhk.co/menodotitit/jfvVid8/pasejemogaxuxasuxofobow.pdf
    • https://cdn.sqhk.co/noviraxat/u4jqnib/healthcare_project_manager_jobs_charlotte_nc.pdf
    • https://tetiwaxope.weebly.com/uploads/1/3/0/7/130776033/kibaminizanaxu.pdf
    • https://cdn-cms.f-static.net/uploads/4496582/normal_6014569944630.pdf
    • https://bojurejid.weebly.com/uploads/1/3/4/8/134887271/5034747.pdf
    • https://cdn-cms.f-static.net/uploads/4487007/normal_601da81151eed.pdf
    • http://rakadan.sportsontheweb.net/gmat_syllabus_2020.pdf
    • https://cdn-cms.f-static.net/uploads/4492294/normal_604e8eaf6b549.pdf
    • https://static.s123-cdn-static.com/uploads/4409604/normal_5fc5984e4cefe.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://b20aee1f-b1b7-4e4e-be5e-d884e4ece670.filesusr.com/ugd/10e3af_0435cbb6e90845fb9046bcc28c8f86fe.pdf?index=true
    • https://0298dc5a-7924-4276-8279-06452a5288da.filesusr.com/ugd/b30cf0_46e61a2b914e4a78b8861be721716bff.pdf?index=true
    • https://af1bea64-f5cd-41c2-a7c1-97f21c1aa057.filesusr.com/ugd/592671_de49e92c74d049cab3e27bb6f87fb089.pdf?index=true
    • https://s3.amazonaws.com/xowasosuf/video_lirik_yg_terdalam.pdf
    • https://ba789de2-c385-43ee-b32d-a34c698d1993.filesusr.com/ugd/b7082a_6171ec06bf0147cdaeed09b7bd9fcf0c.pdf?index=true
    • http://kepofif.onlinewebshop.net/a_prayer_for_owen_meany_chapter_6_quiz.pdf
    • https://s3.amazonaws.com/wopari/they_say_i_say_free.pdf
    • https://s3.amazonaws.com/pizivurapab/what_is_the_nature_of_history_of_christianity_religion.pdf
    • https://s3.amazonaws.com/latufenaw/kampala_university_fees_structure_2019.pdf
    • https://da550aaf-34ae-4f9b-ad82-7836b82beebe.filesusr.com/ugd/a203e6_abbf8883d72c46ed86e5fa833328d2ee.pdf?index=true
    • https://s3.amazonaws.com/befafuni/crp_level_full_form.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001068d.bin
1837a4bda4d77270f6ec13d32254670f00a8916220d25aea6a30f769beaf731c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1068D 5196 bytes
font_01_sfnt_off00011851.bin
7fbd0070eab7eb3713a5128d97a22643d6747fa52ca3ff25fc1e0fd18fb08409		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11851 10696 bytes

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