Malicious PDF — malware analysis report

Static analysis result for SHA-256 54c7cd1d5ca4efd0…

MALICIOUS

PDF

86.0 KB Created: 2021-03-07 05:07:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7ca84b8b423d35e580f35f4c36ed0cb4 SHA-1: 93dc3fee8aa35c649571ec727b2624a0d883eff0 SHA-256: 54c7cd1d5ca4efd09eefbbc303165f6ac9468a1214a80efb37dfd85348a15968
156 Risk Score

Malware Insights

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

The PDF file contains a significant number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or redirection strategy. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the presence of embedded URLs and the overall structure point towards a phishing or malicious content delivery mechanism, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://botokaw.ru/aws?utm_term=amelia+bedelia+first+day+of+school+summary
    • http://promooffer.site/biwifasufoe0fx.pdf
    • http://vomidujoma.scienceontheweb.net/59465860831.pdf
    • http://galosidijixiwu.mypressonline.com/best_portable_cd_player_to_use_in_car.pdf
    • http://labincom-med.ru/vodefefesufebofb0ru.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/324e5e3b-9e14-4fc7-bd68-5f82e60ad86a/28400722134.pdf
    • https://696f1bd8-06c3-47a7-a8f7-e83e17ec8d18.filesusr.com/ugd/5ad03d_ef7a5f9ec141484a87bd4f4652c17448.pdf?index=true
    • https://59b7e61f-9850-45ee-add2-e9646db267e4.filesusr.com/ugd/5b9365_94003a3a619b42c386187e829514d9f2.pdf?index=true
    • https://eed7fa7e-4f31-4ba6-8269-e73f07ac74c5.filesusr.com/ugd/93374d_540a48801eb14adaa7b4ecf28d9bf845.pdf?index=true
    • https://uploads.strikinglycdn.com/files/0484f5a9-79cc-4406-9e9e-9f66d1b3dcea/53639621247.pdf
    • https://s3.amazonaws.com/vuxirefare/hyperkeratosis_treatment_guidelines.pdf
    • https://b84c3727-5d5a-4c5d-9d5d-21cac87b3a69.filesusr.com/ugd/fdd6c2_39c7cd1d09aa4207bb88386b75808ba6.pdf?index=true
    • http://tobikinos.onlinewebshop.net/how_to_put_sony_mdr-xb950bt_in_pairing_mode.pdf
    • https://f1cb2ec4-a82d-4768-8a06-5236a2db220e.filesusr.com/ugd/a2e20a_3ef3ea41825c4a1f81349a5fd5d5fa52.pdf?index=true
    • https://uploads.strikinglycdn.com/files/063784a8-ff1c-4008-8074-bd8080760fb6/18972665790.pdf
    • https://s3.amazonaws.com/jawusawar/linejudofuwarulo.pdf
    • https://a98f38e8-5810-4fc9-be6a-c3d78c7c4f9f.filesusr.com/ugd/921909_17ffa4565b3c411cb68b984912425b78.pdf?index=true
    • https://uploads.strikinglycdn.com/files/c2ed41bd-2e6f-4628-a12c-95ded66d7130/how_to_write_a_restaurant_review_on_yelp.pdf
    • https://s3.amazonaws.com/fizufapu/keno_je_toke_bengali_song_lyrics.pdf
    • https://uploads.strikinglycdn.com/files/fb342c11-d997-43b0-a958-6349b4bf13e7/11162244180.pdf
    • https://438c9214-13ba-44a2-8469-a4c97ff43377.filesusr.com/ugd/5d46a0_e95d041b5fdf4be081d874c036758010.pdf?index=true
    • https://s3.amazonaws.com/legenapi/sivapuranam_tamil_mp3_download.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001134a.bin
17d9efb745e4472cb0356e2073c63ec657ef40504ac9dd805f456a4e04fab59d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1134A 5492 bytes
font_01_sfnt_off000125cf.bin
18ffd4b3f7fabb3829fdde445bc93257febece5dbe937e5eec0a78b831f618db		 pdf-font-stream PDF embedded font (sfnt) at offset 0x125CF 10948 bytes

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