Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0349fe7b9119477…

MALICIOUS

PDF

116.9 KB Created: 2021-04-18 23:02:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: de664523311abb75b44c26b14875bd4e SHA-1: bffb81718cf147028c596cfbd3fb644d4fa74bf9 SHA-256: a0349fe7b911947744c960b30c02f2014b8718477d66ec3b479e7b252e2458aa
156 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for a link farm and is flagged by ClamAV as a phishing trojan. The embedded URL, 'https://jumiwimov.ru/strik?utm_term=how+to+connect+h.264+digital+video+recorder+to+phone', suggests a phishing attempt disguised as helpful content. While no scripts were explicitly extracted, the PDF structure and external links are indicative of a malicious document designed to redirect users to potentially harmful sites.

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-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://jumiwimov.ru/strik?utm_term=how+to+connect+h.264+digital+video+recorder+to+phone
    • https://cdn.sqhk.co/zasokolof/VNhcugd/warren_buffett_house_tour.pdf
    • https://cdn-cms.f-static.net/uploads/4411681/normal_60562e0083ef9.pdf
    • https://cdn.sqhk.co/dafisuwikib/e5ianii/99712122073.pdf
    • https://cdn.sqhk.co/jogekiluse/qvhdhca/redevijufofamokalat.pdf
    • https://cdn.sqhk.co/sazalevimit/a81jiHr/viramesamebekezusilokam.pdf
    • https://wixotofipexux.weebly.com/uploads/1/3/5/4/135400714/figubog.pdf
    • https://cdn-cms.f-static.net/uploads/4500887/normal_602017cf8fdf0.pdf
    • https://cdn.sqhk.co/pafevola/4r5jihd/jesuberodov.pdf
    • https://cdn-cms.f-static.net/uploads/4388841/normal_603cb533db64d.pdf
    • https://xatevixi.weebly.com/uploads/1/3/4/6/134651360/bepibibopudotago.pdf
    • https://cdn-cms.f-static.net/uploads/4470972/normal_6018ee71e4268.pdf
    • https://cdn-cms.f-static.net/uploads/4463809/normal_605403cc5c8bd.pdf
    • https://cdn-cms.f-static.net/uploads/4497071/normal_5fd3157eb5328.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://1628ddcf-e301-416d-9649-d9339b85441b.filesusr.com/ugd/0b1079_e8e8f5edd99f45cdaf0e3119cc7c2cc8.pdf?index=true
    • https://b6e49935-6d58-4bde-831f-6e0b746776d3.filesusr.com/ugd/7d321f_70c77e89805440478d97aea32c331bc7.pdf?index=true
    • https://8a89c5bc-485b-4808-980c-66c60e8d9908.filesusr.com/ugd/834936_5f09755ebe5a484499d6b01874ba5259.pdf?index=true
    • https://0fdd9f25-8366-4660-9463-376fd915ad39.filesusr.com/ugd/c16cf9_39f440390657446ca41470926ab8530f.pdf?index=true
    • https://be08d7d4-326a-4801-be9d-4496af17a43b.filesusr.com/ugd/d31907_afb6f2895b5d474d8eb7d070b6b0ff38.pdf?index=true
    • https://1e438cd7-6f3b-42ac-a97b-d13a75fa135b.filesusr.com/ugd/0c268c_d09f7dcf359240e98cd8592b550378c7.pdf?index=true
    • https://3bcdeb60-9876-4d14-bc0a-1dd1632c647c.filesusr.com/ugd/16a96a_84b25f4239f2402fa374d9203dc16e08.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00016358.bin
a6414dd15c18942a00da0c02455990ff195adecf0c578c048efbc599357e9eda		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16358 3720 bytes
font_01_sfnt_off00017043.bin
838a7051c60f44a10512efc525f8ab84ec9b840b715b725615c338a11ae97d26		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17043 5676 bytes
font_02_sfnt_off000183b6.bin
5967a3cdf6bcd6400f2bd054e73693f4dd90cf96b3e614602e029899be541ca3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x183B6 12048 bytes
font_03_sfnt_off0001acee.bin
d37ea8a4aa44522165bba3182b58808772b64124fc0f057acb8c303b502c54ea		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1ACEE 16748 bytes

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