Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa91c9a2819b9fab…

MALICIOUS

PDF

75.0 KB Created: 2021-03-14 03:00:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 10a4e249aada430725e3cf65a0857151 SHA-1: 4f3a87d006e0d5a275b2e929ffd1e74c59c5b04b SHA-256: aa91c9a2819b9fab61529587ca8dc88f2b77d1ed289e79e33714946876682e43
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating a high probability of maliciousness. It contains a large number of external links, suggesting a link farm or redirection mechanism to malicious sites. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic strongly indicate an attempt to direct users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://lozipotod.ru/strik?utm_term=en+el+principio+el+espiritu+de+dios+acordes+para+guitarra
    • https://cdn.sqhk.co/jivonaxadu/eUihWuc/poxejupegogegow.pdf
    • https://libepuve.weebly.com/uploads/1/3/1/4/131407284/5976259.pdf
    • https://cdn.sqhk.co/gapebeve/GNIjjje/formulierungen_fr_englisch_analyse.pdf
    • https://cdn.sqhk.co/milevatomog/jgdgdU0/pets_mod_for_minecraft_pe_cars.pdf
    • https://tidemipevu.weebly.com/uploads/1/3/0/7/130740592/mipuxif.pdf
    • https://gopopozemilin.weebly.com/uploads/1/3/0/8/130874381/652463.pdf
    • https://bageribo.weebly.com/uploads/1/3/4/5/134592059/larofaweki.pdf
    • https://cdn.sqhk.co/dudilabatod/ibDxheB/dora_s_world_adventure_movie.pdf
    • https://cdn.sqhk.co/xawodoze/iDmnjdV/sevipoju.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/duzexefemosaxe/badrinath_movie_audio_songs_free.pdf
    • https://s3.amazonaws.com/vofadoloves/87892375580.pdf
    • https://s3.amazonaws.com/nunakixuma/linux_guide_to_linux_certification.pdf
    • https://s3.amazonaws.com/jevopemosod/great_is_thy_faithfulness_sheet_music_free.pdf
    • https://s3.amazonaws.com/wovitiku/45928504644.pdf
    • https://1ac5d900-0c69-4f12-8b1d-4e209472b8d2.filesusr.com/ugd/828753_ca29ace790814a818b50bfff63cda0c9.pdf?index=true
    • https://s3.amazonaws.com/fekazudabo/kajivel.pdf
    • https://s3.amazonaws.com/sinamozagemoger/brain_teasers_puzzles_riddles_with_answers.pdf
    • https://1e16da7b-5b4f-4122-a3c4-5c88c9d97cf7.filesusr.com/ugd/83f04e_39594f400e994f3d9d306277794af2ff.pdf?index=true
    • https://s3.amazonaws.com/libusamagowuvo/funurexe.pdf
    • https://s3.amazonaws.com/pukiza/45209508272.pdf
    • https://s3.amazonaws.com/xunilukegez/73483010820.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d772.bin
0ba8ccbd773736921b09197507637345a8fbef8a80cd16a3e1c67fbcc8661d11		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD772 5080 bytes
font_01_sfnt_off0000e8b7.bin
27aa6a612822df9397bcae6e250110594145be1447012637667d7ce56cded74b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE8B7 11540 bytes
font_02_sfnt_off00010de1.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10DE1 4324 bytes

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