Malicious PDF — malware analysis report

Static analysis result for SHA-256 c84c5edefdab0f82…

MALICIOUS

PDF

77.5 KB Created: 2021-03-13 13:37:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a8fd2b03dc09012ff0cf0263ac1baa09 SHA-1: b12dd18eacf75ac15039d891727438891f02848d SHA-256: c84c5edefdab0f823d99b1e6e0b5488ebb24442226b38b97608c7dd91e14f444
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a large number of external links, many pointing to other PDFs, suggesting a link farm or SEO manipulation tactic. One of the primary external links is to 'ponafet.ru/award', which is suspicious. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a phishing or malicious redirection attempt.

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-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://ponafet.ru/award?keyword=action+verb+word+search+pdf
    • https://static.s123-cdn-static.com/uploads/4453144/normal_5fe15902999fe.pdf
    • https://static.s123-cdn-static.com/uploads/4450151/normal_5fed531a05b7d.pdf
    • https://cdn-cms.f-static.net/uploads/4467581/normal_603bb5456922a.pdf
    • https://mixusabap.weebly.com/uploads/1/3/4/0/134096097/9256026.pdf
    • https://vozabamoz.weebly.com/uploads/1/3/5/9/135959881/golofux-kosimoto-muregofejer-vuxakelasezofap.pdf
    • https://xitorudabetibom.weebly.com/uploads/1/3/1/8/131856365/vabopilaxawovoroji.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://8a89c5bc-485b-4808-980c-66c60e8d9908.filesusr.com/ugd/834936_44379f1877a44670bf98d39f586781fe.pdf?index=true
    • https://4a0f17ac-6ce6-4c05-9546-25c48d39d9f7.filesusr.com/ugd/cd79e3_837318e8cb944cfb81943ac836b58534.pdf?index=true
    • https://cf2e1f24-e5f1-4289-9567-3affce9c164e.filesusr.com/ugd/a4ea6c_6e24d733ed8244d99f09ad7f24c9a71f.pdf?index=true
    • http://lagamifex.epizy.com/wawax.pdf
    • https://s3.amazonaws.com/tokatefozude/by_the_shores_of_silver_lake_chapter_15.pdf
    • http://wutireliwuz.epizy.com/toward_a_global_idea_of_race_review.pdf
    • https://77bac38d-831a-46d6-8f22-d7743fcadc58.filesusr.com/ugd/5b9a87_b983628ae3e84e628762c711357e67f2.pdf?index=true
    • https://s3.amazonaws.com/donarepemi/coliform_bacteria_wikipedia.pdf
    • https://631ffb88-cf2d-4844-8d6b-9338a1b21cc5.filesusr.com/ugd/d24e6f_163abb3973dd45bbb743b568a69fec21.pdf?index=true
    • http://mawabubobiniz.rf.gd/ashes_cricket_2009_wii_iso.pdf
    • https://e1ca4115-fb55-43f9-84f1-eaf814f8c83f.filesusr.com/ugd/18122d_e8355fa9a03d4ac09850a44f8bfc7c36.pdf?index=true
    • http://kolofagigetu.epizy.com/95811410380.pdf
    • https://3d9856c9-ddaf-40ef-ab37-14107f3d3ee7.filesusr.com/ugd/938106_f71b30dfdf8e4f0086d35fcd03569c24.pdf?index=true
    • 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_off0000f026.bin
6c57b94c7b1b28148e9d4c75f245f015214c9eed14bfa5b9eee8754485ed16cf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF026 5492 bytes
font_01_sfnt_off000102e3.bin
fa466f2750ea743ab88e3693b2eff8a779246355c8977a39ca3692e126096340		 pdf-font-stream PDF embedded font (sfnt) at offset 0x102E3 11168 bytes

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