Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f3352180f6ef05a…

MALICIOUS

PDF

85.9 KB Created: 2021-05-21 02:13:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b7d4b9415ec2cf6ba02fcf7cde272cdb SHA-1: ea4aab13b7d56f7a5e3ea045cc0e6188cbd199be SHA-256: 8f3352180f6ef05a713422317843537c9401e0ba80593ba7d13fca89aed56bee
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, suggesting an attempt to manipulate search engine results or redirect users to malicious content. The presence of a ClamAV detection for 'Pdf.Phishing.Trojan' and a high ML classifier score further indicate malicious intent. The primary IOC is the initial external URI, which likely serves as a gateway to further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://nipisod.ru/strik?utm_term=heroes+3+hd+maps+download
    • https://cdn-cms.f-static.net/uploads/4389127/normal_606e43e71766a.pdf
    • https://tupokigefadewun.weebly.com/uploads/1/3/4/7/134702618/kibesonaxot.pdf
    • https://kuserivexujeza.weebly.com/uploads/1/3/4/3/134331384/wavuwaribef-punitu-tibapoka.pdf
    • https://cdn-cms.f-static.net/uploads/4463807/normal_6010f6f6eee2c.pdf
    • https://static.s123-cdn-static.com/uploads/4481423/normal_5fe368745f180.pdf
    • https://cdn-cms.f-static.net/uploads/4368495/normal_5fd6de685f822.pdf
    • https://cdn-cms.f-static.net/uploads/4464065/normal_5fd6837f5f9e9.pdf
    • https://cdn-cms.f-static.net/uploads/4476582/normal_603210b32c458.pdf
    • https://static.s123-cdn-static.com/uploads/4419820/normal_5ff0eed9dafd8.pdf
    • https://cdn-cms.f-static.net/uploads/4458616/normal_60142d0779bc5.pdf
    • https://cdn-cms.f-static.net/uploads/4413236/normal_606e712a3b6fd.pdf
    • https://cdn-cms.f-static.net/uploads/4381534/normal_60143f77936ff.pdf
    • https://dofuzubakav.weebly.com/uploads/1/3/1/6/131606612/8c94f.pdf
    • https://static.s123-cdn-static.com/uploads/4378618/normal_5fff16e21f021.pdf
    • https://static.s123-cdn-static.com/uploads/4367923/normal_5fdef0c043892.pdf
    • https://lagukekejase.weebly.com/uploads/1/3/0/8/130815031/bbe19.pdf
    • https://cdn-cms.f-static.net/uploads/4382196/normal_60654bcdd4864.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/gatazeromij/lulirixel.pdf
    • https://uploads.strikinglycdn.com/files/b0899e31-45d1-4b21-a234-dc998a8082bc/how_to_write_intelligence_assessment_report.pdf
    • https://uploads.strikinglycdn.com/files/a4f0d5c6-916f-421f-a3d9-f6950c422b0d/how_do_i_add_positive_and_negative_numbers_in_excel.pdf
    • https://s3.amazonaws.com/zifilobesumafi/domisoxovadiz.pdf
    • https://uploads.strikinglycdn.com/files/4406feb8-a515-4017-a3e9-b4d89e40ee94/33538673724.pdf
    • https://uploads.strikinglycdn.com/files/a98e795c-892c-4ca2-99a7-9ca1909d538b/54530724233.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fa0f.bin
ccf31c42fedf06a616806fa30b5160ba1357f84f503f2e03f064ef62ee28f036		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA0F 5416 bytes
font_01_sfnt_off00010c57.bin
5ba39f9244cb8c0e2d072ca8dd42120a40071aba7e829b79e0386c97e77b74d6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10C57 12076 bytes
font_02_sfnt_off000132af.bin
532315dfdc59b350d447ad91845dd8cc72a836e684f536ab9a4305dc5b53fb8e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x132AF 16204 bytes

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