Malicious PDF — malware analysis report

Static analysis result for SHA-256 45647cd0d0fa7170…

MALICIOUS

PDF

78.0 KB Created: 2021-03-17 22:29:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: d8460ec45613a9694c4f066a5d34e786 SHA-1: c9055e36079a49b6d06b093076b20f474c4a363a SHA-256: 45647cd0d0fa7170fe95428e3c178d5cba02fc7b7861d4e35489d914b117073b
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable hosting, suggesting it's part of a link farm operation. The primary purpose appears to be SEO manipulation or redirecting users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://leonvi.ru/123?utm_term=candle+trading+strategy+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4402517/normal_5fd2179f78c6b.pdfIn PDF document text
    • https://nimekeboxiz.weebly.com/uploads/1/3/0/8/130873861/saninijeze_senarididanolab.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4505363/normal_5fef006475398.pdfIn PDF document text
    • http://alteramaks.world/farid_al-_din_attaruplg4.pdfIn PDF document text
    • https://bigimegena.weebly.com/uploads/1/3/1/4/131438437/cfdbfc7eadcdd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393925/normal_6036758100cde.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495264/normal_60214d295d299.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485309/normal_60406c6a62628.pdfIn PDF document text
    • https://tixasenuwafoja.weebly.com/uploads/1/3/4/6/134658158/kibemof.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475376/normal_602b5a762fe9e.pdfIn PDF document text
    • http://extra-fon.ru/risekomibakakejovegulonu2kabn.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497081/normal_6039d11313d16.pdfIn PDF document text
    • https://jimiwijir.weebly.com/uploads/1/3/4/5/134525211/nodaza_pufejur.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://59af73f0-4134-4839-87a1-08fb2e8aa53b.filesusr.com/ugd/e3c460_6a24523d3ef34bfa93f65005775d42f6.pdf?index=trueIn PDF document text
    • https://507d1b22-ea03-4061-a262-f79425337ca2.filesusr.com/ugd/a374b9_2b712ae7d0c847ba9e9cb79ae1392d02.pdf?index=trueIn PDF document text
    • https://39c3e2ba-dcb8-4bc0-9ed7-0058f02c59d5.filesusr.com/ugd/fd4c29_e1443be7b11d4dde93cb1410c553f3bc.pdf?index=trueIn PDF document text
    • https://f2fffe36-c7b4-4b88-9608-518dc6c14750.filesusr.com/ugd/950b2a_258378e00b4a415ebb796750d691e04a.pdf?index=trueIn PDF document text
    • https://21a67f6d-2aea-439f-a910-ed4feb6be009.filesusr.com/ugd/173616_ad5a3d396fa1490193a46edacc557aa8.pdf?index=trueIn PDF document text
    • https://ba739632-11db-41f7-a023-683a20e55d36.filesusr.com/ugd/99835b_0254c1580fc4469eb440c6870ede4d93.pdf?index=trueIn PDF document text
    • https://1482387f-61d8-47e1-b538-9b7f1e8b89fb.filesusr.com/ugd/538d67_e0070cd850ee4f1ab8b876c3fdbc9a3b.pdf?index=trueIn 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_off0000e761.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE761 5012 bytes
SHA-256: 8080a2a00a4bc2011e096f184875f6a631cbc43d2f12ea1ba77a3d3b41425a57
font_01_sfnt_off0000f880.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF880 10476 bytes
SHA-256: 724468a9b534179a15b55ec795a23df45d2bfeff153a4b3c9a10d140467e9b4a
font_02_sfnt_off00011c0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C0A 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230