Malicious PDF — malware analysis report

Static analysis result for SHA-256 11113e8359f40fde…

MALICIOUS

PDF

86.2 KB Created: 2021-06-10 05:15:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7c868f5da4dd41a4872c5727017dfe1c SHA-1: af531cd531c61464bf7db07f62ab57bcbe427c7a SHA-256: 11113e8359f40fde3c291ddff4c722c3a74ab970bcd0a8e52aaece4db0af69d4
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains a large number of embedded external links, a common technique for SEO spam or phishing campaigns. While no scripts were explicitly extracted, the presence of numerous URLs suggests the document is designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://cructi.ru/pbw?utm_term=chinese+big+boops
    • https://static.s123-cdn-static-d.com/uploads/4426066/normal_60b62d52cfe54.pdf
    • https://static.s123-cdn-static.com/uploads/4468871/normal_5fc8be92e3c86.pdf
    • https://static.s123-cdn-static.com/uploads/4369659/normal_5fff29de282bf.pdf
    • https://static.s123-cdn-static.com/uploads/4367950/normal_5fffd055a7b45.pdf
    • https://bunemevomuw.weebly.com/uploads/1/3/4/7/134733911/13d965c9e.pdf
    • https://cdn-cms.f-static.net/uploads/4484399/normal_5fd1b6f415c48.pdf
    • https://cdn-cms.f-static.net/uploads/4368978/normal_6014b4f4431e6.pdf
    • https://cdn-cms.f-static.net/uploads/4413113/normal_601d7364ca072.pdf
    • https://static.s123-cdn-static.com/uploads/4485926/normal_5fe150ee6895b.pdf
    • https://vonodasanex.weebly.com/uploads/1/3/4/5/134503659/ec0866975336.pdf
    • https://jupufafel.weebly.com/uploads/1/3/2/7/132740723/tekobar.pdf
    • https://mivojunap.weebly.com/uploads/1/3/4/7/134720575/9aa7e1e3c.pdf
    • https://cdn-cms.f-static.net/uploads/4368501/normal_60449faf5cea0.pdf
    • https://static.s123-cdn-static.com/uploads/4371005/normal_5ff8a7701835c.pdf
    • https://cdn-cms.f-static.net/uploads/4481825/normal_605d75ffaceec.pdf
    • https://cdn-cms.f-static.net/uploads/4385413/normal_5fdb1e3e4d68a.pdf
    • https://lexabefi.weebly.com/uploads/1/3/1/3/131384613/wupewugupa-losafe-sepobipoxad.pdf
    • https://cdn-cms.f-static.net/uploads/4502436/normal_602d565130311.pdf
    • http://www.opentle.org
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/7b8fa273-c6a4-44ab-8189-ca6578b569e8/visa_senior_software_test_engineer_interview_questions.pdf
    • https://uploads.strikinglycdn.com/files/5ade48d6-903e-4d3f-8d11-1a62f943ab01/caras_mxico_instagram.pdf
    • https://uploads.strikinglycdn.com/files/6bf14a3c-b368-46cf-bd02-072501f9f85a/stihl_ms310_original_price.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://www.gnu.org/licenses/gpl.html
    • http://scripts.sil.org/OFL

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00010ffd.bin
67e443d76a2fc559c30943c068a71338c9f52116cb2a817dcca2f52749b8ae34		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x10FFD 7560 bytes
font_00_sfnt_off0000ea0b.bin
41cfca4f43251235a46b3315d2fa7a9a9c7380d277d612aaeda5ef2816c6bb97		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA0B 6276 bytes
font_01_sfnt_off0000ffbe.bin
09a4a034b1cba7887606fe415ffcfe815780202076d33d14f36b861c7ddd4d05		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFFBE 4788 bytes
font_03_sfnt_off000124be.bin
0f52b3a508fd1e8ad30c5328f69033e46427751c4478ef9c778a2f55ab0f3f61		 pdf-font-stream PDF embedded font (sfnt) at offset 0x124BE 10980 bytes

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