Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c62d8671eceaba3…

MALICIOUS

PDF

87.6 KB Created: 2021-03-29 03:10:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3217f5e4d056c2389d154e3ed3b0a171 SHA-1: fde3699cc019776b686e8487be10076548e2fa4d SHA-256: 6c62d8671eceaba38227bb2b24931368ad056626de8cca7b136cd6f66e4a8181
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, a technique often used for SEO manipulation or to distribute further malicious content. While no scripts were directly extracted, the presence of embedded URLs and the PDF structure suggest it may be used to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://jacksth.ru/award?keyword=fuerzas+intermoleculares+ejercicios+resueltos+pdf
    • https://cdn-cms.f-static.net/uploads/4425933/normal_6056d494a1da0.pdf
    • http://jusolul.22web.org/alejandro_magno_libro.pdf
    • https://cdn.sqhk.co/nubevitawil/dI6bIjc/safenobabexo.pdf
    • https://cdn-cms.f-static.net/uploads/4413583/normal_5fe7255523ae4.pdf
    • https://cdn-cms.f-static.net/uploads/4413977/normal_60382fa86f762.pdf
    • https://cdn.sqhk.co/letarezetap/Goge6ib/lean_bulk_workout_plan.pdf
    • http://gopizapa.22web.org/nupev.pdf
    • https://cdn.sqhk.co/bitulore/ehgyrUq/69678578381.pdf
    • https://cdn-cms.f-static.net/uploads/4465151/normal_6052b4e85a4e1.pdf
    • http://prazdnikprosto.ru/jufebefukamamikeritobekifbgp3.pdf
    • http://lnstagram-badge-verification.com/84076720077usue5.pdf
    • http://fontawesome.iohttp://fontawesome.io/license/
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://magobugibex.epizy.com/define_loosening_of_association.pdf
    • https://92ddf5cc-4ce7-4caf-b117-8241c553a727.filesusr.com/ugd/42bae0_33bcc91c89f44652930871a67dab52df.pdf?index=true
    • https://6c8027e1-9878-41b3-a9ef-32ba2b6bcd02.filesusr.com/ugd/185811_9e87be5354d044ef9477ce5d0816ba7a.pdf?index=true
    • https://436240a4-ef10-404e-ad90-c5cab949c7af.filesusr.com/ugd/3fb742_e6c45820524d4792bfcc8d8feab982da.pdf?index=true
    • https://92e0cadd-ca3c-497d-ba7d-1aece6ee6da0.filesusr.com/ugd/008e52_2120bb6cd6c844068aea77cff6a43922.pdf?index=true
    • https://a44a9d9e-3ce9-422e-9b5d-83ef2d4925cb.filesusr.com/ugd/3234e9_b347218d9f814196abcb09d4cbd7007d.pdf?index=true
    • https://33fe1336-4051-433c-b691-b763732126dd.filesusr.com/ugd/6c8f37_e444d6d0d5114e73942d910c4ff376c8.pdf?index=true
    • http://fuguduvuduwir.epizy.com/3_column_word_template.pdf
    • http://dapomajaberi.epizy.com/98362935125.pdf
    • https://1c684d3d-b1aa-4d58-8f8e-408f9cf37fac.filesusr.com/ugd/64d889_924d514db81a43e98af6c1bf00588a4c.pdf?index=true
    • https://54179944-c6a3-49b3-9462-5d1939b6aff2.filesusr.com/ugd/49f5ef_a279df32b2554c5fb3b40cb1891ff455.pdf?index=true
    • https://4a7d9d2b-1d67-446c-8d6d-bdd3043d1f60.filesusr.com/ugd/c3d078_930d84c2a74b43b7bcb4096fdec0f266.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010839.bin
eea2f8f1b424c6147b5f20436f7111433954aad756a305b67ce97cf1c359eeb5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10839 2500 bytes
font_01_sfnt_off000112fb.bin
426cb8191806c0c911df1ace640a2430885fc0b94cb65b795b3718820477c849		 pdf-font-stream PDF embedded font (sfnt) at offset 0x112FB 5380 bytes
font_02_sfnt_off0001253f.bin
8d71cb30bd47d6eafb63aa7ad5907370274e8402732cc3afcfb17fff445356c6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1253F 12620 bytes

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