Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f8ebe12c3250e99…

MALICIOUS

PDF

89.2 KB Created: 2021-05-10 22:26:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 3fdc2c9fbd4ae39d5ec1e3a1c524c851 SHA-1: 9750f3224772e164d658320dbf3c25cc584ab3e3 SHA-256: 5f8ebe12c3250e9990efbc87caf9eb87d61c770e39848eca37bef948382fdf53
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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://fokemale.ru/strik?utm_term=innova+3160e+review PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4408593/normal_606d6d42ee4fc.pdfIn PDF document text
    • https://cdn.sqhk.co/dilujuzaga/jpTVwii/hepatic_cyst_causes.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449603/normal_60668a3260d30.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403429/normal_6018d96430c99.pdfIn PDF document text
    • https://paleforekirito.weebly.com/uploads/1/3/4/5/134579508/906b55770827.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4503390/normal_603c4b700dc81.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479707/normal_605b965d18412.pdfIn PDF document text
    • https://cdn.sqhk.co/budatumibowu/hbgdhjV/amazon_fire_tv_mirroring_mac.pdfIn PDF document text
    • https://gifetapajuloper.weebly.com/uploads/1/3/4/6/134682222/580ca5303fa5b.pdfIn PDF document text
    • https://zubikazosiz.weebly.com/uploads/1/3/4/7/134761183/2178777.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://53002a68-e35f-4167-ac88-1ab9777d7e72.filesusr.com/ugd/f5bc2a_85412ad394d3428bac50b4b52ad64c65.pdf?index=trueIn PDF document text
    • http://zasufogokalo.rf.gd/autodesk_building_design_suite_premium_2014.pdfIn PDF document text
    • https://5c09c65f-4728-49e3-9562-8692e696fc4f.filesusr.com/ugd/32acb1_07d346b845b64681be61bf5dec8df1e4.pdf?index=trueIn PDF document text
    • http://gisipusizen.rf.gd/vapinin.pdfIn PDF document text
    • https://5090cb7a-f7dd-45b7-a4a3-960150b62b23.filesusr.com/ugd/dfd4af_d8cde301c3b84c97abb5f7816b081963.pdf?index=trueIn PDF document text
    • https://07bd7893-a6ec-44d5-90fe-c719e602c0bd.filesusr.com/ugd/aafaff_91be677296fe4b3d81f83c582bd6413c.pdf?index=trueIn PDF document text
    • https://4adff18d-dc39-4349-be2c-eeb12737f1cb.filesusr.com/ugd/9117e0_d57b60c08ac34ba6b379e47599de96fb.pdf?index=trueIn PDF document text
    • http://megutid.epizy.com/nozegejafilesef.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_off00011e2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E2C 5072 bytes
SHA-256: 3b58a774dc322dc65b54fb91e8194f56c3b927e7507ac7e810d07f7bfe81810c
font_01_sfnt_off00012f97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F97 11836 bytes
SHA-256: be806e23812d675ef84f1f26eb01bab4b90f955b5b3ebce3d2fc4fd177b5523a

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