Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5c8bfbea5f6dcd8…

MALICIOUS

PDF

95.4 KB Created: 2021-02-28 10:23:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: a8b2b4201fe7df0bc6447b495d4bebf2 SHA-1: 164ea4dd7ea26677c169feab2754e62c23f9b7a3 SHA-256: b5c8bfbea5f6dcd8bfcbe4ee92fd9b7002be3b88bd3991faa9b776cab3270a20
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a significant number of external links, suggesting it functions as a link farm. The presence of URLs like 'https://nipisod.ru/wix?keyword=guide+badges+shop' and 'https://ragusixiseditof.weebly.com/uploads/1/3/0/8/130814169/bawesajitipalopo.pdf' points towards an attempt to manipulate search engine results or redirect users to potentially harmful content. No scripts were extracted, but the PDF structure itself is used to host these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://nipisod.ru/wix?keyword=guide+badges+shop PDF link annotation
    • https://ragusixiseditof.weebly.com/uploads/1/3/0/8/130814169/bawesajitipalopo.pdfIn PDF document text
    • http://memowelubi.mygamesonline.org/how_to_file_a_complaint_against_a_judge.pdfIn PDF document text
    • https://bagawilikazukir.weebly.com/uploads/1/3/1/0/131070307/monebonon.pdfIn PDF document text
    • http://nijalatol.mypressonline.com/end_of_life_software_best_practices.pdfIn PDF document text
    • https://wikivosunox.weebly.com/uploads/1/3/2/7/132741322/3879a210e.pdfIn PDF document text
    • https://zonulezewuras.weebly.com/uploads/1/3/4/8/134890742/56072.pdfIn PDF document text
    • https://tadinitalu.weebly.com/uploads/1/3/4/7/134744808/6539393.pdfIn PDF document text
    • https://wubinuju.weebly.com/uploads/1/3/4/6/134642725/4962022.pdfIn PDF document text
    • http://puliliraforuwu.22web.org/93827679944.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nukasero.epizy.com/39530859662.pdfIn PDF document text
    • http://wasaxotudulolo.epizy.com/american_pie_reunion_2012_movie.pdfIn PDF document text
    • http://lenevetu.rf.gd/fjord_norway_travel_guide_2019.pdfIn PDF document text
    • http://zusaxadixuxot.myartsonline.com/85885045000.pdfIn PDF document text
    • http://zisukuvi.atwebpages.com/bubirijeberodu.pdfIn PDF document text
    • http://tubafurubeg.epizy.com/why_is_my_samsung_fridge_freezer_not_cold.pdfIn PDF document text
    • http://susabumo.atwebpages.com/35015143970.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011590.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11590 5264 bytes
SHA-256: adec5b051475943b8239adeff9c450650ad0a5dfcc110dc428c85214170dc3f8
font_01_sfnt_off00012775.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12775 15848 bytes
SHA-256: 5e582605ea0a725030e2bba3fe23a675504c9545fa8173c99472080f73d9d314
font_02_sfnt_off000158db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x158DB 16204 bytes
SHA-256: 532315dfdc59b350d447ad91845dd8cc72a836e684f536ab9a4305dc5b53fb8e

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