Malicious PDF — malware analysis report

Static analysis result for SHA-256 56aef872cb4e51cd…

MALICIOUS

PDF

78.0 KB Created: 2021-05-27 23:03:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ffef08f5dd647ff3b179c0213fe81a45 SHA-1: 3c19e908462b92c554f45ee3dacd6b1a6aad7330 SHA-256: 56aef872cb4e51cde46a5f9348551092fc3864c34654a10b2d11731faef15f7b
156 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing attempt. ClamAV and ML classifiers also flagged this PDF as malicious. While no scripts were explicitly extracted, the nature of the link farm indicates a likely attempt to lure users to external, potentially malicious, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://zireguxeked.weebly.com/uploads/1/3/4/8/134863403/7543148.pdf
    • https://suziviwibemenaf.weebly.com/uploads/1/3/4/4/134485417/817f4212a179de4.pdf
    • https://fezewozigu.weebly.com/uploads/1/3/4/3/134318815/kipigogogapegakatis.pdf
    • https://lulotileja.weebly.com/uploads/1/3/0/8/130873917/d6f53d9063d8f9.pdf
    • https://dakuxemi.weebly.com/uploads/1/3/4/8/134883968/f3b688fd4cb.pdf
    • https://jexopagovijum.weebly.com/uploads/1/3/7/5/137518486/lebugenujudoworo.pdf
    • https://nobibiraxofos.weebly.com/uploads/1/3/4/9/134904538/3354916.pdf
    • https://resafuki.weebly.com/uploads/1/3/1/3/131398359/410903.pdf
    • https://gaturavokig.weebly.com/uploads/1/3/4/3/134317265/sonegis-pojaluf-midepuvegonifim.pdf
    • https://burekanokem.weebly.com/uploads/1/3/1/0/131069897/bexusologowiliki.pdf
    • https://tusutaxuwipafu.weebly.com/uploads/1/3/4/4/134403355/5925619.pdf
    • https://vubumixot.weebly.com/uploads/1/3/4/7/134751696/63506b.pdf
    • https://fometixivoros.weebly.com/uploads/1/3/1/6/131637143/6307929.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://feedproxy.google.com/~r/wb/ENAH/~3/KjdSuPfhPRY/wb?keyword=advanced%20engineering%20mathematics%20course%20online
    • https://uploads.strikinglycdn.com/files/269a21cf-1a50-4612-abfa-5f2ee5019e02/t-fal_fr8000_deep_fryer_reviews.pdf
    • https://uploads.strikinglycdn.com/files/02e4407c-80aa-46b2-be04-58eef147dc8a/what_light_bulb_to_use_in_an_oven.pdf
    • https://uploads.strikinglycdn.com/files/f1412e0a-04e7-4794-b248-6c345fa9995c/88275329850.pdf
    • https://uploads.strikinglycdn.com/files/650c47a5-7fee-44ec-b559-e493eec5b8e8/rikagoxuduwulozusujima.pdf
    • https://uploads.strikinglycdn.com/files/408960a9-bcd5-495e-b9c5-dd6cea230215/49411991171.pdf
    • https://uploads.strikinglycdn.com/files/45b986cd-b6e6-40e0-b9e0-d51609233a1b/kenmore_116_vacuum_disassembly.pdf
    • https://uploads.strikinglycdn.com/files/08be97f9-fc35-4548-9f8e-c7fe6be44ed3/what_is_the_carta_magna.pdf
    • https://uploads.strikinglycdn.com/files/42846abb-566e-41e3-9025-db0d5779a75b/dieta_alta_en_grasas_y_proteinas_y_baja_en_carbohidratos.pdf
    • https://uploads.strikinglycdn.com/files/556a674a-5a5a-489e-a62b-1c2d8b3c2df2/i_love_you_stinky_face_activities.pdf
    • https://uploads.strikinglycdn.com/files/8359474e-480f-43f7-a365-39b0c839a37c/sabafojuzo.pdf
    • https://uploads.strikinglycdn.com/files/614dab2f-e7be-49cd-9115-125e12dce14c/los_juegos_del_hambre_2_pelicula_completa_en_espaol_latino.pdf
    • https://uploads.strikinglycdn.com/files/17b7692a-5339-4232-94e5-510469c09572/stihl_fs_56_rc_hard_to_start.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_off0000f420.bin
ab520b47443d55bdc922fd1559b00f9134dc8557f8985fbf3a166592e207e2d0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF420 5404 bytes
font_01_sfnt_off00010658.bin
d0e5d3efd425188875f1be216918bdb4b05a0aa2a9baa6663d932295dc217589		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10658 10628 bytes

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