Malicious PDF — malware analysis report

Static analysis result for SHA-256 51ec78190459690d…

MALICIOUS

PDF

78.4 KB Created: 2021-03-28 05:57:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 795d7259854dfed16779da54510da340 SHA-1: 495e02c2b448d2948b6afbfa99b920297db711e1 SHA-256: 51ec78190459690df75381ada06bac0c2eeb8ab1686a148105b89528f9254f40
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It functions as a link farm, containing numerous external URIs that likely lead to malicious content or phishing pages. The heuristic PDF_SEO_LINK_FARM specifically highlights the presence of a mass external PDF link farm, suggesting an attempt to manipulate search engine results or distribute malware through a large number of redirecting links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://seumenha.ru/strik?utm_term=psychology+david+g.+myers+and+c.+nathan+dewall+%252812th+edition%2529 PDF link annotation
    • http://activa-fb.com/184499097331k527.pdfIn PDF document text
    • http://groshyk.site/rectangular_form_in_polar_coordinates6mars.pdfIn PDF document text
    • https://nepuvaduwixoki.weebly.com/uploads/1/3/4/5/134525355/5159203.pdfIn PDF document text
    • http://fb-ig-copyright.com/86286489839hcwl9.pdfIn PDF document text
    • https://nexudusuje.weebly.com/uploads/1/3/0/7/130740550/gusedukax-jatafena-josuz.pdfIn PDF document text
    • http://omerkatanalp.com/halfling_names_and_meaningselrxb.pdfIn PDF document text
    • http://rivepozepuxar.mywebcommunity.org/kugevekobiwaxuwuxejivova.pdfIn PDF document text
    • http://zarewubizeno.mywebcommunity.org/advantages_and_disadvantages_of_economic_globalization.pdfIn PDF document text
    • http://nubatevujonuw.mygamesonline.org/vigulofagamidutajo.pdfIn PDF document text
    • https://sexiguviwuzokal.weebly.com/uploads/1/3/4/6/134687255/6574022.pdfIn PDF document text
    • http://vitrinachel.ru/wumenimofigisimulotirozipl1yy9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://bef89f6e-6323-4b84-ad9d-a44490bfcc4f.filesusr.com/ugd/96768c_4b0854cf5b2b47e0b6cdcfd4b046b7aa.pdf?index=trueIn PDF document text
    • http://buloderijapu.epizy.com/minority_report_tv_show_wiki.pdfIn PDF document text
    • https://87c8fc71-818b-4167-bf0d-2ac3bc49ffd1.filesusr.com/ugd/f9d4cd_5ce040e9a7ea40b980567fea3cbbdb13.pdf?index=trueIn PDF document text
    • http://simipibenafar.epizy.com/national_anthem_of_pakistan_with_lyrics.pdfIn PDF document text
    • https://5849b288-062f-49f8-a71b-da420f1f00fd.filesusr.com/ugd/c068f8_56018e341835451383d0175228658278.pdf?index=trueIn PDF document text
    • http://jupuzagap.rf.gd/bowtech_infinite_edge_review.pdfIn PDF document text
    • https://a765b249-d442-4b07-8ea9-8318d996b894.filesusr.com/ugd/902d29_7f7ded0ea33847b2957463ee5a387968.pdf?index=trueIn PDF document text
    • https://8c7af9c5-a64d-4ccf-a0d2-0c1cd18684e8.filesusr.com/ugd/70c1f8_19968083b94e44cc960a14ebfa69b588.pdf?index=trueIn PDF document text
    • https://85fc0914-20e3-4f1c-be8c-de7e6f89f47e.filesusr.com/ugd/a44510_8d4836f4d162417982a0c60d2583bed6.pdf?index=trueIn PDF document text
    • http://bitines.myartsonline.com/46223452855.pdfIn PDF document text
    • https://696f1bd8-06c3-47a7-a8f7-e83e17ec8d18.filesusr.com/ugd/5ad03d_4fbc8a8fae6d4616a7a95c425fa39bee.pdf?index=trueIn 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_off0000de55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE55 5976 bytes
SHA-256: 6669067ac6fe2a06353be4d5b15509054832c130ebcba9f10b16ff177f7dab96
font_01_sfnt_off0000f2b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B4 10264 bytes
SHA-256: b514957482ec5ab73b7bc834644979a24a365445476d8f2ee8de3de2be94e877
font_02_sfnt_off0001160f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1160F 16084 bytes
SHA-256: 29b8095464fa9501f2379a4c43ca3ba1b1df604f87f2abcbe11fa9bdafb8ec10

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