Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e7a105243fae168…

MALICIOUS

PDF

73.2 KB Created: 2021-05-25 08:13:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 72018efe5ff53ae6079e586450681983 SHA-1: c588afc8806120e1a99416f5c9ccc6d494c2a6c9 SHA-256: 4e7a105243fae168a81f4b191ede2085d3d9cee8e8e744e9a7995303ede2006d
156 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of a large number of external links, including a link farm, suggests an attempt to manipulate search engine results or redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and the nature of the heuristics suggest it may exploit PDF vulnerabilities or embed malicious JavaScript to achieve its goals.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://jacksth.ru/strik?utm_term=aquasource+bathroom+faucet+replacement+parts
    • https://xeziguga.weebly.com/uploads/1/3/5/3/135392729/vamibujan.pdf
    • https://fukagopesuzidad.weebly.com/uploads/1/3/1/3/131381553/9803535.pdf
    • https://jefilixepiras.weebly.com/uploads/1/3/2/6/132681342/zegew-taludirizerimo-mutanirariz-najowifit.pdf
    • https://static.s123-cdn-static.com/uploads/4491437/normal_5fc9bb7acf402.pdf
    • https://bowogemiris.weebly.com/uploads/1/3/4/3/134316512/luwajajo.pdf
    • https://cdn-cms.f-static.net/uploads/4503387/normal_605a54c6cc3d3.pdf
    • https://tevufipe.weebly.com/uploads/1/3/1/6/131606546/40f19f3.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/bejideba/elements_of_news_reporting.pdf
    • https://uploads.strikinglycdn.com/files/86742eb7-cfcf-4e9c-82c1-31390d8a3d6c/lusedozedagemu.pdf
    • https://uploads.strikinglycdn.com/files/4d573c8a-8291-4f4e-b7ea-20ffae74c869/disepilikefufovojenafor.pdf
    • https://uploads.strikinglycdn.com/files/b2d45a38-f7f2-4d3d-bcb2-0de50cddf638/boss_dr_3_drum_machine.pdf
    • https://s3.amazonaws.com/tidigudetefumof/fodemikafalexejode.pdf
    • https://s3.amazonaws.com/dazifozixawus/best_30k_legion.pdf
    • https://s3.amazonaws.com/jeduzizonox/ejemplos_de_limites_de_funciones_algebraicas.pdf
    • https://uploads.strikinglycdn.com/files/76434b78-79b8-426e-a0de-cacd5fe8dc65/46723133883.pdf
    • https://uploads.strikinglycdn.com/files/4c6ab1dc-cd77-4640-a310-b69b3ffd91bc/msi_760gm-p23_fx_amd_socket_am3.pdf
    • https://s3.amazonaws.com/vukujidor/why_do_cecily_and_gwendolen_keep_diaries.pdf
    • https://s3.amazonaws.com/pipaneku/17456774040.pdf
    • https://uploads.strikinglycdn.com/files/5938c3f9-7eb3-4ab7-8766-d98c3f011db6/innova_3100j_code_reader_reviews.pdf
    • https://uploads.strikinglycdn.com/files/0d04b207-772c-43b3-b395-ee09c476e2a5/dusopolofewikaden.pdf
    • https://uploads.strikinglycdn.com/files/76a3cb3c-dad6-4e64-94fb-ac34f29925ee/convertidor_de_pulgadas_a_milimetros.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d5af.bin
58c010c68d14e5b71a39bf8cff2e2f62734a60a669dff641dcb74ba54a1c04b4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD5AF 5344 bytes
font_01_sfnt_off0000e7b2.bin
65249684a85c40e4372565035307dbf61b206b00ea152107c575d375e0b1c4e9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE7B2 9760 bytes
font_02_sfnt_off00010927.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10927 4324 bytes

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