Malicious PDF — malware analysis report

Static analysis result for SHA-256 361dd264ca42cb18…

MALICIOUS

PDF

102.3 KB Created: 2021-05-09 09:16:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 6a1c8fc83738c92b2812c1c95f83ad67 SHA-1: 0a24328ccaa369a1cae93449c7c4e1ae6d247b0d SHA-256: 361dd264ca42cb184356638acecd4b102219bb1e1d56352918e6fc05526a98a7
186 Risk Score

Malware Insights

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

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious sites. The presence of 'utm_term' parameters in some URLs indicates a tracking mechanism, common in phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://dugedepap.ru/strik?utm_term=definitionado+level+16+question+4 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4467950/normal_5fed06fab678b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426059/normal_60404ea61dbe2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489598/normal_603fa1605890c.pdfIn PDF document text
    • http://femonejigajape.mywebcommunity.org/ipa_symbols_and_examples.pdfIn PDF document text
    • https://tudegikugil.weebly.com/uploads/1/3/5/3/135317618/misol.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422658/normal_603633ea5a551.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485156/normal_5feb3909cd98e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388842/normal_606e8f91ebb63.pdfIn PDF document text
    • http://niburufajanuto.sportsontheweb.net/limuzokedixamarone.pdfIn PDF document text
    • https://jexewibovagajuk.weebly.com/uploads/1/3/4/4/134485971/4346822.pdfIn PDF document text
    • https://lumamiwaba.weebly.com/uploads/1/3/4/7/134735329/wofizet.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391925/normal_60483a7e33461.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4472185/normal_5ff45dfb64e3e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446399/normal_5ff76622792a0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417123/normal_60472847b4de5.pdfIn PDF document text
    • http://xexapitanegis.getenjoyment.net/median_gdp_per_capita_uk.pdfIn PDF document text
    • http://dorulezebum.sportsontheweb.net/example_of_extended_abstract_for_conference.pdfIn PDF document text
    • https://siroxejuvumuku.weebly.com/uploads/1/3/4/6/134657252/1382000.pdfIn PDF document text
    • https://xabanovodo.weebly.com/uploads/1/3/0/7/130739860/3e1847084d4e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e8408a2-9197-40ad-9bf6-2d32eb9961a0/kindle_keyboard_reset.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a40f20b-06d9-4cff-b45a-4911864158cb/whats_a_good_safety_slogan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc306072-77a2-47b7-bb93-b57aa6e11b74/is_twilight_zone_available_on_netflix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/36ce79b2-f6e8-4472-af21-60367fac3dc5/sinikila.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_off000139c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139C0 5284 bytes
SHA-256: 192d62565b314107b36a7ddc036692523453e69df87d7374cdf9438ca1b4c3b7
font_01_sfnt_off00014be1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BE1 12460 bytes
SHA-256: 73d0709dcf3e1b9bf50e15c29036ac0698701d52d90286b1e3a836ca27f98d24
font_02_sfnt_off0001766c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1766C 16204 bytes
SHA-256: a95eff378c135b1ab40d10b3cd1da1bafbc07f86005f57898d079c90d712ddbd