Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5c57d509f0237f5…

MALICIOUS

PDF

99.3 KB Created: 2021-03-29 22:54:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: ebc79d2b20e6ee71cf35ae0941ffcaf8 SHA-1: e20e338f1b84bf52f390e53719ef2f69cc048e5c SHA-256: f5c57d509f0237f5208dcf62f7b136432a01923e4de459fefa7ad73c6165cc32
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to unknown or disposable domains, suggesting a link farm or SEO spam operation. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://pelibifir.ru/wix?keyword=cutmaster+42+service+manual PDF link annotation
    • http://magnifioco.site/482322788239wkff.pdfIn PDF document text
    • http://opensalon.xyz/50214497190v3942.pdfIn PDF document text
    • http://oyuncuxx.com/bhagavathi_tamil_movie_hd_video_songsho0hq.pdfIn PDF document text
    • https://nefolebar.weebly.com/uploads/1/3/4/4/134400051/dosodanot_sitezeluwekixen_jidotube.pdfIn PDF document text
    • https://fexagoresex.weebly.com/uploads/1/3/4/3/134337575/xotulite.pdfIn PDF document text
    • http://detonic-official.website/xatonafudwmb1a.pdfIn PDF document text
    • https://voperupazekeko.weebly.com/uploads/1/3/4/5/134505312/f48fc957f4.pdfIn PDF document text
    • http://esportzmlevent.com/mixed_costs_examplesdtyv.pdfIn PDF document text
    • http://securityverifiedservices.com/why_does_he_text_and_then_disappearl0kca.pdfIn PDF document text
    • https://tobejisexin.weebly.com/uploads/1/3/1/4/131454505/jumotemogaxaza_jozakevim.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/3cb8eb7f-48dc-4c4a-b4bf-4cecf0fb1722/cobra_19_ultra_3_tuning.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a175486f-1c80-4506-ba8a-7f432b909709/the_landlady_themes_and_symbols.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/32d0fd9a-53e4-45d0-b271-29ddf8f68be0/juego_tabla_periodica_interactiva_gratis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/06c36122-b74a-441b-ae97-ee00651087c8/misazuvitasumo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5430d9ff-e76b-4c3a-86c6-7ba57238d67a/bowflex_workout_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/63bb9a75-8418-49f6-9063-10271461c1ba/where_do_you_put_a_dehumidifier_in_the_basement.pdfIn PDF document text
    • https://s3.amazonaws.com/gonafoziguwewe/43075525452.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2cd49f4f-4a0c-4a47-940b-f9669527fd84/zaxadogedepowene.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c867d378-5acb-4272-858c-d464a76c407d/93068728581.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3fa42d88-10a2-48a8-8608-0435532ed217/96506319005.pdfIn PDF document text
    • https://s3.amazonaws.com/perurulexi/vubekipagorukomixigoser.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013490.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13490 5020 bytes
SHA-256: 6f178b23836c65f7aee241f3683811b287375564813b63fb0b3fdd8f8afd2ea3
font_01_sfnt_off0001458f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1458F 13368 bytes
SHA-256: c91b05b93a4d4247a8947d5373f0b0584a553cad4b50a2fda084c7a73bbf4e17
font_02_sfnt_off0001713b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1713B 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230