Malicious PDF — malware analysis report

Static analysis result for SHA-256 c149644a3cfb9a78…

MALICIOUS

PDF

78.1 KB Created: 2021-05-24 08:23:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: cb97de57a7ebbc39cef66b93225ee4e2 SHA-1: cfd8dfc5c97dd7c6a4bec894f85b65cae364470c SHA-256: c149644a3cfb9a78ef122a0eba748b1b259da6b05d1e55cf13e7dddecfdbff33
136 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a lure for a 'free 360 degree leadership assessment tool' which, upon inspection, redirects to a suspicious URL. This URL is flagged as an SEO redirector, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly support the malicious nature of this file, likely serving as a phishing document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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=free+360+degree+leadership+assessment+tool PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4412758/normal_602f16e690744.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474176/normal_5fd18ddedf577.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403952/normal_5fedd4896b7c2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475737/normal_5fdd97645658b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413112/normal_6026294d2825c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444630/normal_5fecf35f58068.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404745/normal_6053c9508bfa5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421641/normal_6062b219baf7a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445573/normal_60127356bd482.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412778/normal_6003af56ee99d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446147/normal_602c468b92911.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421640/normal_606d8f29bb148.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379045/normal_5fca875e25723.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369173/normal_6014859279214.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411219/normal_5fe66245d1ff3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409405/normal_603ab9c1ca14b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449779/normal_5fe9c5d0103ca.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459469/normal_5fcbd8e1c1006.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453901/normal_5fc89c65def7d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/salade/3772180890.pdfIn PDF document text
    • https://s3.amazonaws.com/somisilegex/beetlejuice_banana_boat_song.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_off0000f3a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3A9 5788 bytes
SHA-256: b9004f134fc986950cb2fbdb29518617e2a39a48cc0eae0b29851925a92509e3
font_01_sfnt_off0001072c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1072C 10596 bytes
SHA-256: 163f76e55f15fd58910788196f3d1216d758f23e2f2d7ddc675e55f416c2c50c

Open this report in the interactive analyzer, or submit your own file for analysis.