Malicious PDF — malware analysis report

Static analysis result for SHA-256 abfd428e1feb62d9…

MALICIOUS

PDF

87.4 KB Created: 2021-05-15 02:47:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1b98d06fb537951b10e85706efee3527 SHA-1: b2d369e66a9d1d97f036e317a17b0276d52f9d92 SHA-256: abfd428e1feb62d9565348d4bdfc654bd2ad3b5e24d7b2379caa000c88753c76
156 Risk Score

Malware Insights

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

The sample is a PDF document identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains a large number of external links, with the primary one being 'https://ponafet.ru/strik?utm_term=the+battle+of+the+labyrinth+full+book'. This suggests the document's purpose is to redirect users to potentially malicious or phishing websites, leveraging a link farm strategy. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ponafet.ru/strik?utm_term=the+battle+of+the+labyrinth+full+book
    • https://cdn-cms.f-static.net/uploads/4423442/normal_6016039bc64eb.pdf
    • https://cdn.sqhk.co/fudikeraz/5xk4jj8/backtrack_cs_go.pdf
    • https://cdn.sqhk.co/vavetiset/XNqBijr/cable_one_boise_tv_guide.pdf
    • https://davokirik.weebly.com/uploads/1/3/0/7/130739121/vokuzu_wetojinurivili_vomotatozeto_ropiru.pdf
    • https://mifabawir.weebly.com/uploads/1/3/0/7/130776047/nujaxubosodak-kiraraxu-felivipuwozuroz-tinefa.pdf
    • https://cdn.sqhk.co/nibijegun/bdghbTU/xexudim.pdf
    • https://pudixibavumop.weebly.com/uploads/1/3/5/9/135964902/tikos_venajedemen_kogawavedeja_tubixa.pdf
    • https://cdn.sqhk.co/lekusovu/1gvgjQh/billie_eilish_lovely_ringtone_free_download.pdf
    • https://cdn.sqhk.co/nilofixogezu/awghh5e/moxibitilotululiv.pdf
    • https://cdn.sqhk.co/noxuluni/agfJhdX/ntt_indycar_2021_schedule.pdf
    • http://nigoguno.scienceontheweb.net/aprendizaje_activo_101_estrategias.pdf
    • https://cdn.sqhk.co/wekaradukuve/dehghiZ/jisagugoju.pdf
    • https://static.s123-cdn-static.com/uploads/4410674/normal_6002c78793afe.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://faleferesevo.onlinewebshop.net/genero_lirico_ejercicios.pdf
    • https://6cdf8c5e-36a0-4b6d-987f-32d3d50030cd.filesusr.com/ugd/3c2e2e_2f1c036e2659439c81983ca170b675ae.pdf?index=true
    • http://tiruweditivunaw.myartsonline.com/vax_ccmbpcv1p1.pdf
    • https://d6ac5066-27fc-4e71-a07d-b30af50dfe8b.filesusr.com/ugd/934fc3_1f5ea8691c0e4dec8b134e908e9ad2cf.pdf?index=true
    • 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_off00011927.bin
ab46c61d404b470bdba4c95c28229063915e173892bec46332e8519562352c09		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11927 4932 bytes
font_01_sfnt_off000129f5.bin
a053794bd042321da8744a5f8841c1b0069fee6a77686d56b8a8dcad5634b3ea		 pdf-font-stream PDF embedded font (sfnt) at offset 0x129F5 11436 bytes

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