Malicious PDF — malware analysis report

Static analysis result for SHA-256 96b791c917144df7…

MALICIOUS

PDF

80.6 KB Created: 2021-03-14 13:43:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 1b77a294ff7c57644f150a3b593ea9d6 SHA-1: b105d370c7eb358c47093f9f4ff555b0878ed471 SHA-256: 96b791c917144df79824d7e7fc7ec06593560279a58c99fe385c1aacfe9b8159
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was identified as malicious by multiple heuristics and a machine learning classifier, with ClamAV detecting it as a phishing trojan. The file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing campaign. The document body is heavily obfuscated and appears to be generated content, further supporting a malicious intent to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://botokaw.ru/award?keyword=prontuario+del+cemento+armato+pdf PDF link annotation
    • https://navowilupaxit.weebly.com/uploads/1/3/1/3/131381067/8606c862.pdfIn PDF document text
    • https://cdn.sqhk.co/bowazeduz/jigchiM/sushi_catering_nyc.pdfIn PDF document text
    • https://ludunijup.weebly.com/uploads/1/3/0/9/130968942/2616320.pdfIn PDF document text
    • https://cdn.sqhk.co/dasisogi/jbufijH/76417308780.pdfIn PDF document text
    • http://anarchymedya.com/caldera_peisa_dual_manualuorxe.pdfIn PDF document text
    • https://cdn.sqhk.co/pixisuja/ifhcjcn/idle_incremental_games_unblocked.pdfIn PDF document text
    • https://funefazadoma.weebly.com/uploads/1/3/4/6/134648765/2302760.pdfIn PDF document text
    • http://apparently-home.com/mufumepgimg.pdfIn PDF document text
    • http://yblda.fun/concept_of_improvisation_of_instructional_materials0rtdx.pdfIn PDF document text
    • https://tujezagen.weebly.com/uploads/1/3/4/7/134775207/zimigujubat.pdfIn PDF document text
    • http://orbitan.fun/91301788455y359w.pdfIn PDF document text
    • https://mebemawadaj.weebly.com/uploads/1/3/5/2/135295691/wiwomixefikal-pezafulutorun.pdfIn PDF document text
    • https://cdn.sqhk.co/wusoxopejezo/jjKDchc/63187763134.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://e8e87dc5-637d-47ba-9de6-e7d98d123d78.filesusr.com/ugd/a69a03_3b5121f8884249eb958f5c66bf9fba27.pdf?index=trueIn PDF document text
    • https://27aa3d6a-fcc1-4574-a8e0-77dd5bf64dcc.filesusr.com/ugd/7683ec_6b9729049bd04fd4994b3a0ba40809d6.pdf?index=trueIn PDF document text
    • https://959e49da-b405-4961-97d4-5c1bb2e9a628.filesusr.com/ugd/ab0441_05e830aa7b5e4e228b1e6549769c37da.pdf?index=trueIn PDF document text
    • https://9b08d158-0e0f-4203-9b31-e1272d977b1c.filesusr.com/ugd/086daf_fc504c2e0169426ab96451a553ee48db.pdf?index=trueIn PDF document text
    • https://3df06c22-1e8a-4082-8cc2-a0fdc0609706.filesusr.com/ugd/d86e81_d41e4f4c34d04664b85b05f9362e9bb1.pdf?index=trueIn PDF document text
    • https://469ee322-798e-4c1d-9571-af6764901f97.filesusr.com/ugd/57169b_12d2a3bf35bd44019017b8994390d736.pdf?index=trueIn PDF document text
    • https://51bf459c-6b46-41b0-863f-532cf8a77e0d.filesusr.com/ugd/2eedf1_49c9a4d0ae4f4aac9965473a394fd537.pdf?index=trueIn PDF document text
    • https://0879403c-3be5-48e4-925f-21334a7d5cfe.filesusr.com/ugd/407fcc_8475a486e7b04880a9a459fe0af09903.pdf?index=trueIn PDF document text
    • https://9d76d0c6-5807-43ac-a2ba-7b4112d1a20a.filesusr.com/ugd/5cd33b_abb34e9a85ef41c7822e7dbf7446498b.pdf?index=trueIn PDF document text
    • https://8eccd3b7-fb20-4588-a5b5-4d8c58591879.filesusr.com/ugd/0e6328_e7988128f1474add82a5f04bd268e478.pdf?index=trueIn 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_off0000fd27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD27 5124 bytes
SHA-256: c5d77058856eff4282d7ad0d375ac29200b2ca4db604c4670b231570433968ad
font_01_sfnt_off00010e7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E7F 12092 bytes
SHA-256: 5ef949c62861a1ab5554d2d3d829b0a79644e12a0b778c3f720525c0fb1554c4

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