Malicious PDF — malware analysis report

Static analysis result for SHA-256 5224a5e26829101e…

MALICIOUS

PDF

118.6 KB Created: 2021-02-12 20:12:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 20fee7e48194b6643226450e98ca1e3f SHA-1: 793e00db1eca2705c58fef8ec9aec8057ee7acf7 SHA-256: 5224a5e26829101e2354f3d631498322b452f73d897766fc74e53742dd786088
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous external URLs pointing to other PDF documents, suggesting a tactic to manipulate search engine results or distribute further malicious content. The presence of multiple disposable host domains and UTM parameters in the URLs further supports a phishing or spamming operation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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=i+do+declare PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4497638/normal_601feff4742d7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463808/normal_5fcf50a146a68.pdfIn PDF document text
    • https://sidomepavoresob.weebly.com/uploads/1/3/5/3/135322675/rutoteme-tidiweled-limezumap.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393893/normal_600fc5a419782.pdfIn PDF document text
    • https://zafapuguma.weebly.com/uploads/1/3/2/7/132712217/vogakubowob.pdfIn PDF document text
    • https://parukiwodisurup.weebly.com/uploads/1/3/4/4/134455528/kezonanak_mimul_josila.pdfIn PDF document text
    • http://golosa-spasibo.ru/10938312663sbma0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393751/normal_601cce7677457.pdfIn PDF document text
    • https://fejizokifod.weebly.com/uploads/1/3/5/3/135341395/diwokif.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366384/normal_6011223a24ddb.pdfIn PDF document text
    • https://pijetupuz.weebly.com/uploads/1/3/4/3/134351396/japivupit.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386849/normal_5fe4ebe711335.pdfIn PDF document text
    • https://vexakoloninabi.weebly.com/uploads/1/3/4/8/134851928/fajasalezaka.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367952/normal_5fcbc6623d94b.pdfIn PDF document text
    • https://sudarixadozitot.weebly.com/uploads/1/3/5/3/135331315/e23f6c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://s3.amazonaws.com/nelizenejakarug/wedidirudevodolebat.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_007_off00019042.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x19042 23928 bytes
SHA-256: d9d5dc7f8aece51112a9431bae330482271be245909868694b0cd73e96af31d5
font_00_sfnt_off00010114.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10114 12028 bytes
SHA-256: c7f10cf8e0cde220fd2ad94a6ae921cf2a160ccf44c31ea70b444c4884e7ad08
font_01_sfnt_off0001289b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1289B 4692 bytes
SHA-256: fcb564604623d45e35dae1ef68a533163408537d18bd2bdc61a5e2dafbbc15b9
font_02_sfnt_off0001388c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1388C 9356 bytes
SHA-256: 1e7d8a077aff409c80660f4e3c60a5ad8b05d40eb9b1cf0e594db8c4fa729a06
font_03_sfnt_off00015260.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15260 22004 bytes
SHA-256: 6390d5fa8a1f2777b6a0b81f7a435c6622127467ba0822d311aaf77b52f5be3b
font_05_sfnt_off0001bb02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BB02 4416 bytes
SHA-256: dbcf0eb89c7b680573dc660aec315a8562c58b93b96001a35d562240b4c661d9

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