Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cf8b22a7c7499a7…

MALICIOUS

PDF

109.9 KB Created: 2021-03-22 09:54:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 5a3561336fd7c2993af82cb5ade6bb20 SHA-1: 22fd8eac930aff9aab2c20968df118bd3fa67645 SHA-256: 1cf8b22a7c7499a79bbecb7c49b5198b65ce269b71804eb80fcaa4dbe1c24a3c
176 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains heuristics indicating it is a phishing lure, specifically a payment redirection scam. It embeds a URL that leads to an SEO redirector, which is a common tactic for phishing campaigns. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • 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=handmaid%2527s+tale+age+rating+book PDF link annotation
    • http://kaxiwemusemoj.mypressonline.com/fraction_bars_worksheets_3rd_grade.pdfIn PDF document text
    • http://wiboratiraveguw.mygamesonline.org/xefuduriwodovafiw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474752/normal_5fe9c56724eca.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/46db2cb8-17c4-40d7-8643-c5377c4c40a6/can_you_get_a_cpr_license_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/78f699e5-e937-4924-af42-a684cc897a60/canon_powershot_elph_170_is_charger.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a7830e56-d793-4710-8408-bb65728cc40c/87986380326.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/faf74fcc-3dea-49e9-92cc-53b4a74791ca/cobra_14_band_360_laser_codes.pdfIn PDF document text
    • https://s3.amazonaws.com/gapuruxumeg/alfredo_soares_bora_vender.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/48d3f952-6cb5-42bd-89bd-98c03447ff39/9375906367.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/924356e0-b371-4bb8-aca7-94a0cf22375c/resumen_libro_tu_puedes_sanar_tu_vida.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/387c7112-c895-436d-96c5-faddf7bbea02/why_is_the_samsung_refrigerator_not_making_ice.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f8a5b58-1ce1-4a37-a7b0-af189ed6bb7f/34552520101.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/66126dc8-0522-46d9-9b16-7257b9864b37/wotiziw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d0ce84fa-cc01-4646-b270-2e3d54cc3607/17260807114.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/64cac3ea-d4e3-43be-91ee-8f767e8c286e/big_fish_audio_momentum_sampler.pdfIn PDF document text
    • https://s3.amazonaws.com/lerezazo/37451098737.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_off00016f46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16F46 5344 bytes
SHA-256: 80f4b6a8f2785def233ebf6e961a09db0e21b6cc36d92614d973c37dba60566f
font_01_sfnt_off0001815b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1815B 11516 bytes
SHA-256: 0f7a0d689673ee3afc7041b5722fb5c7811a89b13022c4376cecddb3b07bd52a

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