Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6366ad1ae8a54d1…

MALICIOUS

PDF

70.3 KB Created: 2021-03-29 05:36:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: d9d1ad1e9dff4541c01f192dc6e117f2 SHA-1: 943c7aedc3a821393168960bb2961ee9c8ae6abe SHA-256: b6366ad1ae8a54d13ac53f2cb69851acb8119873d64a9ffcb77081601da87958
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://pelibifir.ru/wix?keyword=brainpop+periodic+table+of+elements+worksheet+answers PDF link annotation
    • https://tadirexexex.weebly.com/uploads/1/3/2/6/132695418/9567386.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367668/normal_60255f7c1f088.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375702/normal_5fe2e85c6627c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450440/normal_603f36da9ae80.pdfIn PDF document text
    • http://wikurabafewo.iblogger.org/tidegixigone.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421960/normal_5fe2da7b4011f.pdfIn PDF document text
    • https://nirilepewo.weebly.com/uploads/1/3/4/6/134657632/rogobi.pdfIn PDF document text
    • https://jadowusirufire.weebly.com/uploads/1/3/2/7/132740355/monotariligowozovele.pdfIn PDF document text
    • https://cdn.sqhk.co/lekibefefu/bThigii/79173331230.pdfIn PDF document text
    • https://cdn.sqhk.co/kasavakujosi/hj28hgU/jepad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402964/normal_601fd79986217.pdfIn PDF document text
    • https://razivizufizide.weebly.com/uploads/1/3/4/5/134525322/jidotanegepil.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://1fa67a36-2e8b-44cc-a955-751d80433762.filesusr.com/ugd/d85e51_829a448744674ff0a993a5c89ce5f899.pdf?index=trueIn PDF document text
    • https://bfb79b04-db4d-4c54-a74a-4733ff68ceb9.filesusr.com/ugd/11291b_a937c21a68d54ed4a9c1978e07d3948b.pdf?index=trueIn PDF document text
    • https://1094d5c0-a920-47c7-a1de-7e2d56a92d84.filesusr.com/ugd/47b1e8_400e814f2ce245fb9803c962693cfec2.pdf?index=trueIn PDF document text
    • http://sojoramuf.epizy.com/septic_arthritis_pediatric_guidelines.pdfIn PDF document text
    • https://9e9203d9-9f5b-42f2-a849-05e42d741f90.filesusr.com/ugd/3527d5_cef8d67d099147b480dd01dffdfc9cac.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d360.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD360 5740 bytes
SHA-256: d35e3774c25358c1a2ae6c763ed02a87c7725a76b0799ea29401d267b74be1bd
font_01_sfnt_off0000e6d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6D0 10968 bytes
SHA-256: 225cd6dbcce286fbaaa51ebd007c9bbcd87cef8228ac68f012f3db01703f2408

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