Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4ee4861976619df…

MALICIOUS

PDF

80.2 KB Created: 2021-03-11 02:40:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: d3b0ca77c34063a791b113116caadd8b SHA-1: 0011a68dcc2f2508da874445ea125926b772b7f4 SHA-256: b4ee4861976619df5840311b2aeab7f90e5d66f35376b11d404312a4b0202aed
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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/wix?keyword=gta+5+download+mod+apk+ios PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4393041/normal_5fe07c1b49d17.pdfIn PDF document text
    • https://cdn.sqhk.co/puvegipuros/ijhFjjv/rasemeripidefufe.pdfIn PDF document text
    • https://cdn.sqhk.co/pagozixupezi/jLjdL40/dark_knight_trilogy_poster.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383304/normal_6042c6718493e.pdfIn PDF document text
    • https://cdn.sqhk.co/wodelaganav/0ifhcAm/42125646620.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426547/normal_601a352f7321c.pdfIn PDF document text
    • https://cdn.sqhk.co/muligumixe/71dkThg/missing_you_brandy_tamia.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455208/normal_6010e1691d046.pdfIn PDF document text
    • https://wewiruvikaju.weebly.com/uploads/1/3/0/7/130775929/pafesovivozonaseri.pdfIn PDF document text
    • http://kovuzaxaf.medianewsonline.com/pogagepolaxetipaginosap.pdfIn PDF document text
    • https://cdn.sqhk.co/pimupigedu/bjajdhi/jepuku.pdfIn PDF document text
    • https://gunajogozezulom.weebly.com/uploads/1/3/5/3/135385825/bijegoga.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428039/normal_600fbb8d6e2db.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://c03439ef-6557-4199-865e-586791a52b6c.filesusr.com/ugd/6bb4a2_8d3e2c8e94444316b69f41df81e3858d.pdf?index=trueIn PDF document text
    • https://ce099f17-eb12-430b-a452-8d789b3ee5a8.filesusr.com/ugd/aef5b7_a5ed55b042dd465a8d3b0973e0bbd892.pdf?index=trueIn PDF document text
    • http://widifusi.myartsonline.com/sonibexinewadagepewopexu.pdfIn PDF document text
    • https://ef9935f7-a918-44a1-999f-f1d50a45e4a7.filesusr.com/ugd/b463f2_058bc75060ba4179a269e0e25cc89c1d.pdf?index=trueIn PDF document text
    • https://2e03c77f-99cc-4591-9807-54d8d49c9ce6.filesusr.com/ugd/759733_0ddee7daef2048d49e818a3d6bb09624.pdf?index=trueIn PDF document text
    • http://bukezodebas.onlinewebshop.net/backsliding_christian.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_off0000f0d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0D9 4992 bytes
SHA-256: 421a99a128f7ffa190acd78a0badd89023a1c1e011973652c0b3276364240682
font_01_sfnt_off000101d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101D4 10288 bytes
SHA-256: e275539133afb8aa5a3d346e5d7f7e6aa5cd4860e18ef467010471703260d1d2
font_02_sfnt_off00012525.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12525 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176