Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5ff26dbadb37765…

MALICIOUS

PDF

198.8 KB Created: 2021-03-24 17:24:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 1d99fb6889d985fdd35cf804b903aa44 SHA-1: d2828e558c6c742464f72bb4b4e18dcbdea70159 SHA-256: d5ff26dbadb377654547b7bb9f25263f29f8432a7d5be8b46c9695856cf035d8
136 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. A high-confidence heuristic identified an image lure linking to an SEO redirector, specifically 'https://nipisod.ru/strik?utm_term=historia+de+la+iglesia+cristiana+libro+resumen', which is characteristic of phishing campaigns aiming to trick users into downloading further malware. No scripts were extracted, but the PDF structure and URL suggest a phishing attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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=historia+de+la+iglesia+cristiana+libro+resumen PDF link annotation
    • https://cdn.sqhk.co/veletafi/hdbihSX/gugukujanapofamop.pdfIn PDF document text
    • https://cdn.sqhk.co/kizafizutuw/c81diig/galaxy_shooter_alien_attack_cheats.pdfIn PDF document text
    • http://wedipum.mygamesonline.org/how_to_explain_personification_in_poetry.pdfIn PDF document text
    • https://cdn.sqhk.co/dufadafakuti/cgehdhd/bichagadu_movie_audio_songs_naa_songs.pdfIn PDF document text
    • http://wegaturagifo.getenjoyment.net/64593664920.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xulaxun.rf.gd/algernon_blackwood_the_doll.pdfIn PDF document text
    • http://bufolezipozazom.epizy.com/lesazipovuwaja.pdfIn PDF document text
    • https://8eb0ff2f-1b5f-41fb-a82b-bf279dc7f43e.filesusr.com/ugd/868f76_399b9d73095d4e1a9cd924e74dbe25ba.pdf?index=trueIn PDF document text
    • https://ab9101c8-a046-40a0-ba79-761bab9f3367.filesusr.com/ugd/61fb7c_3ac2408e1f0a4d66ac8fc1d1267dacb0.pdf?index=trueIn PDF document text
    • https://ecab545c-19d2-4654-b6ac-fb8b9749f5ba.filesusr.com/ugd/e5412a_caf5cc848ee14121b868d43c6980591a.pdf?index=trueIn PDF document text
    • https://ff9dba89-6132-4485-99c2-ace8a2453124.filesusr.com/ugd/c3f59f_36154fa42b5248b9a35a25bed4085926.pdf?index=trueIn PDF document text
    • https://976edc35-935c-46de-9e6e-e225dbc25668.filesusr.com/ugd/0829d8_9f5ea58044e8438daeda0cc738806c62.pdf?index=trueIn PDF document text
    • https://8641c524-1fb5-4292-87ed-dd72f64d6c22.filesusr.com/ugd/9b7d8a_6d2a9590900f4c56898165094560e310.pdf?index=trueIn PDF document text
    • http://pagumasobud.rf.gd/fuvotojudivitifitekaral.pdfIn PDF document text
    • https://e13cb47a-ba10-42f5-a9cf-93317d05919f.filesusr.com/ugd/1fa6dd_30e48cff36c84b5eb453b2d748ccfe64.pdf?index=trueIn PDF document text
    • https://2c9641c8-5874-4869-9b94-f1378e60aa6b.filesusr.com/ugd/efc1f6_d63d184283f94adf8d056df31f622ba1.pdf?index=trueIn PDF document text
    • https://98be45bc-63b9-4117-aff7-84a3d4f2c4a0.filesusr.com/ugd/90c678_0e5847fda1ed4a4cb85503868843c0aa.pdf?index=trueIn PDF document text
    • http://gabukinof.epizy.com/rubulurebirivaxuvoso.pdfIn PDF document text
    • https://5a6df620-610b-4d6f-8f1b-71e936bb70bc.filesusr.com/ugd/1f5cef_e75e6ea37b6b428eb9c340b29d3f3a5f.pdf?index=trueIn 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_off0002d1ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2D1AC 5360 bytes
SHA-256: 97cc237cf08b0df4ba0efec214c9eff1971981e33b982b4750c717e65be85f0b
font_01_sfnt_off0002e3cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2E3CB 11784 bytes
SHA-256: 93225fcc6bca756d75927118962d2f9e031166e9396ea320824375ad1a979083

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