Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a5edc75d865dd46…

MALICIOUS

PDF

75.3 KB Created: 2021-05-21 17:26:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 03dd2a0620fd3a5b6803ed9c6f9d680e SHA-1: 82e422257e7e041d3583f92d42e881ac1ba0dad0 SHA-256: 5a5edc75d865dd46805d7491b6d3f99c2f6c6e96aad1be0ea32d26915092861d
186 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by both ML classification and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or SEO spam operation designed to redirect users. The embedded URL `https://gimoguvi.ru/strik?utm_term=how+to+reset+altec+lansing+speaker` is likely part of this redirection scheme, potentially leading to phishing or malware distribution.

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://gimoguvi.ru/strik?utm_term=how+to+reset+altec+lansing+speaker PDF link annotation
    • https://ligapixoxos.weebly.com/uploads/1/3/4/3/134378271/120267a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4498348/normal_603089e766800.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464521/normal_601c5fa48a6b3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500417/normal_5fd866b3196df.pdfIn PDF document text
    • https://wofenexezut.weebly.com/uploads/1/3/4/3/134310974/kikuvovidatenaruk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366042/normal_601a9bc600ff7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373239/normal_604fb5323405c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490123/normal_6027904d5ce34.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455642/normal_6012fb3bbed8f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443814/normal_6036f8da7f3c8.pdfIn PDF document text
    • https://vasidigugadojo.weebly.com/uploads/1/3/0/9/130969577/a69d4f34.pdfIn PDF document text
    • https://wetuxabo.weebly.com/uploads/1/3/0/8/130873937/gowoliwipusiniti.pdfIn PDF document text
    • https://rigegafotu.weebly.com/uploads/1/3/0/7/130740045/kavifeba.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378848/normal_5fed9240b1f95.pdfIn PDF document text
    • https://rifubagozoj.weebly.com/uploads/1/3/2/6/132695416/kozanusagurijupog.pdfIn PDF document text
    • https://kufesivewafe.weebly.com/uploads/1/3/1/3/131384244/kuxajexaxezave_jutopofixi_vunaxodorurazex.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/6c0dbcf6-ec31-4d6a-b805-32eee49e2328/libro_de_ejercicios_un_curso_de_milagros_mp3.pdfIn PDF document text
    • https://s3.amazonaws.com/farokof/harmony_of_the_gospels_macarthur.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/221835ec-1eb1-4f33-8ebd-ddc319ea18a6/dd-wrt_routers_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c841e31-2c08-4aaa-8d36-3d195e18cb30/craftsman_10_inch_mini_tiller_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/rekorewexidiwo/2020_honda_rebel_500_for_sale_near_me.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/75642cd2-493b-4626-9725-a4f3943bd57c/zalokesar.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_off0000e8b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8B9 5216 bytes
SHA-256: 31e9ce8ba9da7ba4f9f94d0c63d787b06ce0a28cccdec61a12fc9ca8436c268b
font_01_sfnt_off0000fa9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA9B 10760 bytes
SHA-256: 3b47866c579dcc35f7134fcdfafeaae50628175dc286fcc4a1fbc6cf9168ce67