Malicious PDF — malware analysis report

Static analysis result for SHA-256 a40ad40a28dd6597…

MALICIOUS

PDF

82.4 KB Created: 2021-03-06 15:50:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 1e7d898f11a94951666cb55334453776 SHA-1: ad2b4ae78cc303dda199e0c37475e9d19863b374 SHA-256: a40ad40a28dd6597527be1c71976859e2f5f5b757ed1c61ea5b4b82c3accef2b
186 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as a link farm, containing a large number of external links to other PDF documents. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. The embedded URLs and the nature of the link farm suggest an attempt to manipulate search engine results or lead users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://vilenefex.ru/wix?keyword=letter+of+intent+to+sell+property PDF link annotation
    • https://cdn.sqhk.co/puvegipuros/GF3gh8K/sidofuzivogiga.pdfIn PDF document text
    • http://dokukuke.mypressonline.com/what_is_philippine_constitution_definition.pdfIn PDF document text
    • https://nifogagerosore.weebly.com/uploads/1/3/5/3/135300162/xuwokeni.pdfIn PDF document text
    • http://nogurufegu.mygamesonline.org/yoga_breathing_exercises_to_strengthen_lungs.pdfIn PDF document text
    • http://vozivovog.scienceontheweb.net/the_way_to_happiness_l_ron_hubbard.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490133/normal_601ae0627d259.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409811/normal_602be10cf0209.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402953/normal_60286a56dcc67.pdfIn PDF document text
    • https://ririzunok.weebly.com/uploads/1/3/4/7/134712782/6b133f3d0eb3058.pdfIn PDF document text
    • http://vimabanu.sportsontheweb.net/guitar_chord_book_online.pdfIn PDF document text
    • https://gipulafu.weebly.com/uploads/1/3/4/4/134442702/3047534.pdfIn PDF document text
    • https://vatovuturok.weebly.com/uploads/1/3/1/8/131856009/127747.pdfIn PDF document text
    • https://cdn.sqhk.co/pazakazagoz/jcibjbl/abba_greatest_hits_vol_2_vinyl_value.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393761/normal_5fcebc063caa4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d0fd53c2-66a5-49f7-a942-a4bfc50892a3.filesusr.com/ugd/11baf9_a69cb780ba7940b69d4ce9b2671c02c3.pdf?index=trueIn PDF document text
    • https://af431a04-9ebc-4ea4-a98d-45e4ffbfad14.filesusr.com/ugd/485053_7df04da3080f4e88ab5034eb97dff4aa.pdf?index=trueIn PDF document text
    • https://bff5fdab-9fd0-4670-908b-a1308bb5a9cb.filesusr.com/ugd/227d0f_ebd6c4988ad44a6eb38f7fde83e7c306.pdf?index=trueIn PDF document text
    • https://5a4e7950-e122-4b3c-9cf7-894e7f5b1216.filesusr.com/ugd/76aeb6_5cd8fe6ebd734dbb8f39857bf3bbb5d7.pdf?index=trueIn PDF document text
    • https://5a1138df-423b-4a5d-a7c7-36223740754e.filesusr.com/ugd/a72fa8_f688de80219e499096680f71fdb4a46d.pdf?index=trueIn PDF document text
    • http://sebokegekesuded.atwebpages.com/woxevejuxodemapuwomu.pdfIn PDF document text
    • https://5e73d190-47a4-4ead-99bf-7e9069f06a16.filesusr.com/ugd/55cc32_d7ca7745e32f477ea9d47481be177367.pdf?index=trueIn PDF document text
    • https://7a9095e9-4ba3-4ff7-9406-a75d0382ce8a.filesusr.com/ugd/db93e9_8da8277fb72741c08f1ba7b55dd4aa70.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f35f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF35F 4728 bytes
SHA-256: 19c0cb7bc801005e4ad98611623e06db40da782a92e014a83a5bb7b133cbad85
font_01_sfnt_off00010396.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10396 10368 bytes
SHA-256: 61ee59c80047654e7b4a3d17da5ab3812cf51aa84df283b87b54a5873e84a536
font_02_sfnt_off0001274b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1274B 16088 bytes
SHA-256: 9b6ad5722d12b30ebaf898f562fd4d85af749794f3aca0f1f676e444c262175b

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