Malicious PDF — malware analysis report

Static analysis result for SHA-256 9205d50a42afd73e…

MALICIOUS

PDF

80.3 KB Created: 2021-03-18 09:48:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 049891568e9956e6d4bf506e2696a639 SHA-1: 656105a59e8649ed1d75a8c6c3750a3e5163077a SHA-256: 9205d50a42afd73e1a8b6cf48497ca1855a4a3f91246212ad2cc162aa2830f59
186 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous external links, with heuristics identifying it as a link farm on disposable hosting, suggesting a phishing or SEO abuse attempt. The embedded URLs, such as 'https://gimoguvi.ru/wix?keyword=archery+merit+badge+worksheet+answer+key' and 'http://cetop.xyz/gupenegazefapuvogixesw9vag.pdf', are likely intended to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://gimoguvi.ru/wix?keyword=archery+merit+badge+worksheet+answer+key PDF link annotation
    • http://cetop.xyz/gupenegazefapuvogixesw9vag.pdfIn PDF document text
    • http://mowukedova.mypressonline.com/adjektivdeklination_daf.pdfIn PDF document text
    • https://vejarava.weebly.com/uploads/1/3/1/0/131070596/e392d7.pdfIn PDF document text
    • https://viwoseloza.weebly.com/uploads/1/3/4/8/134861971/9441134.pdfIn PDF document text
    • https://selamosufuk.weebly.com/uploads/1/3/4/4/134463567/883cd693be7ff9.pdfIn PDF document text
    • http://tixanijematewe.mypressonline.com/cytological_fixatives.pdfIn PDF document text
    • https://zuzesewijolane.weebly.com/uploads/1/3/1/4/131406438/zarubina-dupibemi.pdfIn PDF document text
    • https://xemalijojododud.weebly.com/uploads/1/3/0/9/130969235/jigab_tewebison_jababaxewu.pdfIn PDF document text
    • https://vimasavugaf.weebly.com/uploads/1/3/4/5/134587410/buterujinu.pdfIn PDF document text
    • https://redulexaxoxega.weebly.com/uploads/1/3/0/8/130874010/1197ce.pdfIn PDF document text
    • http://vowujebotoza.mywebcommunity.org/77327983568.pdfIn PDF document text
    • http://copyrightmediahelp.com/short_consultancy_agreement_template_uk4bt2u.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://b6e49935-6d58-4bde-831f-6e0b746776d3.filesusr.com/ugd/7d321f_02b57243505e4ac4a6df4797a946783a.pdf?index=trueIn PDF document text
    • https://72cee60b-533f-4fda-9f40-87b1bb6f0553.filesusr.com/ugd/590778_0e5269fefb574895b259a4d7a96a77f7.pdf?index=trueIn PDF document text
    • https://88749095-6fd7-453f-8e8a-15b48fe47dd1.filesusr.com/ugd/e4d7df_d7b68329fb714fd4a179c1243f57abe5.pdf?index=trueIn PDF document text
    • https://e85625e8-91d5-48c2-95a4-67b7b95d5b39.filesusr.com/ugd/b97a97_d15ffce5d44e4aa5959b8718baaccc11.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/fbb065fa-f330-4334-abda-75e30571695d/what_does_real_gdp_not_measure.pdfIn PDF document text
    • https://dda5c79a-a75d-44d9-a006-48dec3bfe172.filesusr.com/ugd/115d6e_ef2308cfd0214a70ae6ceeba51f312a2.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/28fe7aca-ef33-4071-85c0-35b72863691c/29410398481.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eecc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEECC 5708 bytes
SHA-256: adcd808050139796493ee073700546654d05bc23ce7b97532235ab6e9242e870
font_01_sfnt_off0001022b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1022B 16208 bytes
SHA-256: da146a796572289ee3393458bbafac512b435e3dac592e25e0234b73d40d0e60