Malicious PDF — malware analysis report

Static analysis result for SHA-256 95b886a0ab2be10f…

MALICIOUS

PDF

82.5 KB Created: 2021-03-19 10:42:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 23561779567bf620c06844508a18bed1 SHA-1: de19bffce2235151fb4ecbfc3ff6b987ab60b3ea SHA-256: 95b886a0ab2be10fa6c4d11e12c8dc6568df0d769c584f44a95d84297665c0d8
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it likely exploits a vulnerability for client execution. It contains a large number of external links, suggesting it functions as a link farm or a phishing lure, directing users to potentially harmful websites like 'jacksth.ru'. The document body is heavily obfuscated and unreadable, providing no further context on its specific intent beyond the link farm heuristic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://jacksth.ru/wix?keyword=goldstar+air+conditioner+gp120ce+manual PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4379851/normal_5fca811016178.pdfIn PDF document text
    • https://zikowajemaje.weebly.com/uploads/1/3/1/6/131607239/kumuzisazemogeg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474176/normal_6053885f80d46.pdfIn PDF document text
    • https://vemenujobife.weebly.com/uploads/1/3/5/3/135399872/gopizexevima.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367005/normal_5fe7d61e93e11.pdfIn PDF document text
    • https://vawilateg.weebly.com/uploads/1/3/4/6/134697686/18d12a1d.pdfIn PDF document text
    • http://duplicwcnj.space/missing_children_202061oda.pdfIn PDF document text
    • http://golden-charm.ru/intermediate_algebra_for_college_students_6th_edition_freed00xh.pdfIn PDF document text
    • https://kofivenemiwelew.weebly.com/uploads/1/3/1/3/131380814/duliludobuxilufu.pdfIn PDF document text
    • https://bupekotarox.weebly.com/uploads/1/3/0/7/130739944/9d2e93a033761f8.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/eb24c74c-4931-4021-9142-dc9524028b06/diono_radian_5_reviews.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/60b32876-1ae5-45c3-8ef8-19056db7236e/zavofira.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/46e15203-4952-49b2-87e9-cda65c7f2fe0/lithium_carbonate_davis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1bd6de7b-0314-4979-a606-bbb5e78fb373/dagikusamakidoz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/190c439b-38a7-4319-96ca-9c6fa1bfcee5/45511619040.pdfIn PDF document text
    • https://s3.amazonaws.com/kumasala/derokeridupatadipug.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0856f6e3-2180-4754-a83a-58d9a94e068a/mabojefakuk.pdfIn PDF document text
    • https://s3.amazonaws.com/remufuzu/bemelu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b8f2f9ed-04c4-430b-9f94-da61a3127297/revalaturu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4280212d-6742-421c-935e-88f2af705951/chemical_equation_for_saponification_of_coconut_oil.pdfIn PDF document text
    • https://s3.amazonaws.com/jujadodedaruxix/kogulonagenoti.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba8e4024-5b3a-4d91-90af-7da0990cb369/jukatok.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0832dcd-d02a-4707-8a7b-2fcd64298215/javulutaworetedugobim.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_off000103a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103A3 5752 bytes
SHA-256: 477c0806f25c34309bc308104108ade3c48597770629dbe6a05f245218038fde
font_01_sfnt_off0001172d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1172D 10848 bytes
SHA-256: aded5c6a5d824cdedf7f29b8fe66aa2d97a25334451c1e0326ddcfb18afbd287