Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a4ae05646e4b03d…

MALICIOUS

PDF

101.4 KB Created: 2021-05-24 16:06:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 7b3c1f94237fddebad8d9e00d24a6205 SHA-1: 7b0d0337eb3c5cfb64143f2788177c69f98efad6 SHA-256: 1a4ae05646e4b03dffa789bfb2420f7f22c45cc36fa0bae8a89007ed93fb0a4e
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with one prominent link pointing to a suspicious domain ('vilenefex.ru'). The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to exploit users by directing them to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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
  • 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.
  • 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://vilenefex.ru/strik?utm_term=cronica+de+una+muerte+anunciada+resumen+cap+1 PDF link annotation
    • https://menesifewo.weebly.com/uploads/1/3/0/8/130814293/soporaxuf.pdfIn PDF document text
    • https://rudemituwidiv.weebly.com/uploads/1/3/4/5/134585289/nomas_bezeluzojal_bisabodesojabo_pesapu.pdfIn PDF document text
    • https://zojujevekuki.weebly.com/uploads/1/3/0/9/130969212/gidumeborodewopaji.pdfIn PDF document text
    • https://muxapikaw.weebly.com/uploads/1/3/5/3/135346573/joguvetejofusufifodi.pdfIn PDF document text
    • https://tefojemitadu.weebly.com/uploads/1/3/1/6/131606809/8833453.pdfIn PDF document text
    • https://bufujibuku.weebly.com/uploads/1/3/4/8/134862056/kopazu.pdfIn PDF document text
    • https://didunomupipopad.weebly.com/uploads/1/3/1/4/131438203/16229554.pdfIn PDF document text
    • https://luxufaxunixepu.weebly.com/uploads/1/3/4/5/134584211/c9aa14892ab.pdfIn PDF document text
    • https://fukorolavo.weebly.com/uploads/1/3/4/6/134639224/5276345785.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wizakokowe/violin_scales_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/liguwubore/a_alphabet_hd_wallpaper_free.pdfIn PDF document text
    • https://s3.amazonaws.com/mubemutolewe/probability_density_function_examples_and_solutions.pdfIn PDF document text
    • https://s3.amazonaws.com/jasipefulaxiduj/baal_veer_episode_134.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc3c69d7-a815-4438-9669-41825c4880f5/2087165025.pdfIn PDF document text
    • https://s3.amazonaws.com/tinezedu/xakivisaxojavagurebuked.pdfIn PDF document text
    • https://s3.amazonaws.com/varoximu/rocketstock_free_templates.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/16616ed3-1ef1-48b1-a26b-086b605ba106/review_of_vox.pdfIn PDF document text
    • https://s3.amazonaws.com/dazovosugev/how_do_i_charge_an_old_ipod_shuffle.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5df07535-1b26-4e88-ba96-ffbef8100f70/vibadijeju.pdfIn PDF document text
    • https://s3.amazonaws.com/tufujifinobiro/49025648099.pdfIn PDF document text
    • https://s3.amazonaws.com/mefovu/faxos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/79144e26-58e2-411b-88d9-38d09baf7d7c/37284761317.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/18eea69b-8ee5-409f-ad22-9e8c7ebd627f/bikinapagodoze.pdfIn PDF document text
    • https://s3.amazonaws.com/sivanira/5740022015.pdfIn 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_off00014ea1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14EA1 5144 bytes
SHA-256: 7551eca0ca5a5d6ac8fc2be99cffbaed5c6fcfc85b5336eabb8b8169f9ab7dd7
font_01_sfnt_off00016008.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16008 12396 bytes
SHA-256: 5586aab8ac37939974d3844de1647502e1fa55a2a41e697533d3b65d0ba63f85