Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c83c349b2f8a1e5…

MALICIOUS

PDF

65.5 KB Created: 2021-03-21 10:01:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4f2be3dbcfa44b4eca024a17bfb16eec SHA-1: 9b71e2d09b574374bc9d115af1e9697308b645ac SHA-256: 8c83c349b2f8a1e5b548411545f791e02a8d72d3c122d26f5bcb9708f901305d
156 Risk Score

Malware Insights

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

The PDF contains a heuristic indicating a link farm and an embedded URI pointing to a URL that appears to be a lure for a magazine download. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution through a network of linked PDFs. No scripts were extracted, but the structure suggests an attempt to drive traffic to malicious or deceptive content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://soxebez.ru/award?keyword=ubqari+magazine+august+2020+pdf+download
    • https://cdn-cms.f-static.net/uploads/4499942/normal_5fe85826dae83.pdf
    • https://cdn-cms.f-static.net/uploads/4462714/normal_6056c35ed6693.pdf
    • https://cdn-cms.f-static.net/uploads/4496571/normal_604f72fc89c68.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://d4cba69e-f3c5-4a64-9e40-69ba24924691.filesusr.com/ugd/b73feb_a89b53de054148ad841b3b325d11b373.pdf?index=true
    • https://uploads.strikinglycdn.com/files/8aae5a0c-7f0e-4719-bda3-2ded8af5ab48/pabofoxonurolalif.pdf
    • https://s3.amazonaws.com/rowubunak/dr_andreas_moritz.pdf
    • https://af1bea64-f5cd-41c2-a7c1-97f21c1aa057.filesusr.com/ugd/592671_16e33893a2934197a491e48a8cc49516.pdf?index=true
    • https://b354d503-40d1-4c97-84b4-bc0b16c12f35.filesusr.com/ugd/8c7d07_db08964774154c83a585837de3ea32e7.pdf?index=true
    • https://0e01c86c-6ad9-43de-bc04-b8819f410213.filesusr.com/ugd/73c254_5f7b245f816e4b6daa3bd6f357ad105e.pdf?index=true
    • https://d0a6b1b1-1773-4622-8b5e-0ab5990a7ed3.filesusr.com/ugd/b90ba1_c51ac0b02f22468184d811c858f849a2.pdf?index=true
    • https://s3.amazonaws.com/wuxupewu/sony_a6500_vs_a7iii_size.pdf
    • https://1261df91-4e32-40b2-8b8a-4050d3c54cbb.filesusr.com/ugd/df69c1_0032e510b56444c19927e09dbac42cfd.pdf?index=true
    • https://uploads.strikinglycdn.com/files/2c254854-4431-4a67-8e7f-4a88edadc3fa/44236010521.pdf
    • https://s3.amazonaws.com/xafaxotaful/data_analysis_tools_examples.pdf
    • https://2a983b51-2e13-4971-8c1f-a5bca3ab4353.filesusr.com/ugd/e1a791_c8c931c8754c41e0b76190b3fec5cf97.pdf?index=true
    • https://s3.amazonaws.com/retisovojor/national_sepsis_guidelines_uk.pdf
    • https://s3.amazonaws.com/lonozote/54112980701.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_off0000c0ed.bin
65a47a738d5c5ce80cb21ceac7b1ce28ba0db9a7cf4fc7980cad2f4ff5e0e4d2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC0ED 6032 bytes
font_01_sfnt_off0000d56f.bin
b9127782c513eb59a5c885a37bf5b429bf5d3343f210139938620b0827b79898		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD56F 10548 bytes

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