Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a8c73e60761ecfe…

MALICIOUS

PDF

74.4 KB Created: 2021-04-26 16:41:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: d77018b174b8e5436f1343203a6bdb37 SHA-1: 08eac0606223b13187c26d78aae894df74d66222 SHA-256: 6a8c73e60761ecfe579cdd030b82dc3e787d4dace944008669ced60fd90b0b1b
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 related to 'sugar measurements' which redirects to a suspicious URL. Heuristics indicate this is a phishing attempt, and ClamAV detection confirms it as malicious. The embedded URL is likely used to download a second-stage payload or redirect to a phishing site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://gimoguvi.ru/strik?utm_term=cuantos+gramos+tiene+una+cucharada+de+azucar+morena PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4446165/normal_60229246ca3df.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453747/normal_5fcb9fde9e4a1.pdfIn PDF document text
    • http://rutekotugu.22web.org/52128628208.pdfIn PDF document text
    • http://jawirigagoboni.iblogger.org/65059049888.pdfIn PDF document text
    • http://tefosewun.22web.org/nujap.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://ponuruv.rf.gd/31056377795.pdfIn PDF document text
    • http://kutadomirezo.rf.gd/49129998031.pdfIn PDF document text
    • https://s3.amazonaws.com/mogedozara/critical_thinking_company_language_smarts.pdfIn PDF document text
    • https://s3.amazonaws.com/siwixomudit/bebonizabotebolorepakokis.pdfIn PDF document text
    • http://kafokenenore.rf.gd/bacterias_utilizadas_en_la_industria_alimentaria.pdfIn PDF document text
    • https://63aa7d51-6c54-48cc-ac87-b710a0da19c3.filesusr.com/ugd/c8d394_1b439689f52f40438e6413eb96f25de9.pdf?index=trueIn PDF document text
    • https://0dc5016f-38c0-4e11-84f4-4717e3ef4ec7.filesusr.com/ugd/4fd84c_31f683139d49481a835e6f9fb71e18be.pdf?index=trueIn PDF document text
    • https://92fed17e-af34-466b-b3fe-38cd9ef27699.filesusr.com/ugd/192d58_416cdae92f88481eac19bf02ed1fc1a7.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fedojigudaj/all_bhojpuri_dj_song_free.pdfIn PDF document text
    • http://lowuzoduveloga.epizy.com/brain_teaser_matchstick_puzzles_with_answers.pdfIn PDF document text
    • https://a79fbd7c-12a6-44fe-9d3c-43dc2b0795a8.filesusr.com/ugd/f95141_a4b4c9d0e89243709680b91f2357e302.pdf?index=trueIn PDF document text
    • https://d45380bd-a93d-4ef2-b2bd-4c7806d1f6db.filesusr.com/ugd/5d2cf3_4bde34a68655426fa7d0116d7bad7224.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/laginekux/is_the_dark_knight_returns_canon.pdfIn PDF document text
    • https://s3.amazonaws.com/vizegemawokaxe/10528594356.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_off0000e172.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE172 5276 bytes
SHA-256: 9466824c7cf135d27f5ce33281a5f196218f3b7f4dac620f6c6553ad08311f55
font_01_sfnt_off0000f338.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF338 12292 bytes
SHA-256: 55eb6f7b66b7e999c226d5a140855a4bfa7a236c360ca1622acc19304b8c97d8

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