Malicious PDF — malware analysis report

Static analysis result for SHA-256 33177d6ceeb77bc5…

MALICIOUS

PDF

45.5 KB Created: 2020-11-07 08:22:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 0e7f3cd57b090d64869e9d2236295228 SHA-1: b18c647fdab26d52dc96d86841e22e8098b4d70e SHA-256: 33177d6ceeb77bc5565103f63b120d6c000499da8d59688632804fa32ce63e33
106 Risk Score

Malware Insights

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

The PDF document contains a high-confidence heuristic indicating it is a lure for free downloads, linking to an SEO redirector. The embedded URLs and document body text, which discusses 'Manual-D' duct design, are likely intended to trick users into downloading a malicious file. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • PDF carries website-builder CDN document link farm medium PDF_CDN_PDF_LINK_FARM
    PDF contains many clickable PDF links parked on website-builder CDNs or simple download gateways together with visible ebook, manual, or download lure text. This matches generated SEO document carriers used to route users through untrusted link/download chains; the PDF itself is an inert link carrier.
  • 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://traffnew.ru/aws?keyword=manual+d+duct+design+manual PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4418587/normal_5fa19c6914bb9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368751/normal_5f8b445a8da9d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367311/normal_5f8fc834ed1f1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387562/normal_5f8d754978457.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375209/normal_5f8a10f763a3c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374951/normal_5f9edf3d5941c.pdfIn PDF document text
    • https://s3.amazonaws.com/domegagowevag/94053774241.pdfIn PDF document text
    • https://s3.amazonaws.com/kakef/waterproof_paper_calendar_2020.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410211/normal_5f99676078115.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366625/normal_5f882fc1c2436.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380531/normal_5f8c9acc8c7e2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464056/normal_5fa58110cac5a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383302/normal_5f92dec56be57.pdfIn PDF document text
    • http://www.ascendercorp.com/In extracted file (font_00_sfnt_off0000654a.bin)
    • http://www.ascendercorp.com/typedesigners.htmlIn extracted file (font_00_sfnt_off0000654a.bin)
    • http://www.daltonmaag.com/In extracted file (font_02_sfnt_off0000996b.bin)
    • https://uploads.strikinglycdn.com/files/78f7944e-29cb-41b4-a2a3-177de5c888e4/sebubijixikep.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a19fa1a1-ac86-48e9-87ae-03eee5b15f5e/gufenuwasotav.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 extracted file (font_00_sfnt_off0000654a.bin)

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000654a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x654A 4940 bytes
SHA-256: c59dac11a0acef0700484b6d5d98db942c33171e346cc6392fb858b610b1c5a9
font_01_sfnt_off000075fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x75FD 10396 bytes
SHA-256: d324836e6da1740ef9eeb081159bd3bf53d1875a2f240b981313fca5c75fda68
font_02_sfnt_off0000996b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x996B 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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