Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2a191a5accec50d…

MALICIOUS

PDF

79.1 KB Created: 2021-05-20 15:00:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 06474fc66c9f4a46f5382ff9a3c5a417 SHA-1: 3bbf2e3717f5af0a388cf7b6c3f5f9ba272ff8d8 SHA-256: a2a191a5accec50d5da8830a4a833b207aa2ffaa47ba8d6e007a73851b996c50
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document body, though heavily obfuscated, contains a string related to restoring deleted text messages, likely a lure to trick users into clicking the embedded URL. The primary IOC is the external URL which is likely the destination for a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 4

  • 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://dafemum.ru/strik?utm_term=restore+deleted+text+messages+android+without+root PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4454824/normal_60662e142fb90.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485176/normal_605216abe5417.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482206/normal_6019cd8824c0e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374519/normal_5fe5defbcbac0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481836/normal_605888e369e4e.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/gurafoga/muxujivobekewo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/11eeedfc-57a9-4f0d-8d19-ad7263adcee8/scratch_3.0_tutorials.pdfIn PDF document text
    • https://s3.amazonaws.com/kodipopujufipig/71564778618.pdfIn PDF document text
    • https://s3.amazonaws.com/nilititonawafim/dazomirosujufuzewixusil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/34814c14-aa38-46e9-8dda-b8a516940ee5/plantronics_voyager_legend_uc_firmware_update.pdfIn PDF document text
    • https://s3.amazonaws.com/liguwubore/65797034942.pdfIn PDF document text
    • https://s3.amazonaws.com/jafujasiwetid/balevuwo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d69cede-4cd7-4b97-9076-8dba320d98ef/2019_toyota_camry_se_v6_horsepower.pdfIn PDF document text
    • https://s3.amazonaws.com/varoximu/11518208390.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6dc963fa-5c1c-4e1e-a4fa-1bf1d7b10fc0/kuzila.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/122e0bf8-db56-46da-95b4-b3ca766ca8b6/fowiledaxiratejodexuv.pdfIn PDF document text
    • https://s3.amazonaws.com/zuguvoxoki/37288203824.pdfIn PDF document text
    • https://s3.amazonaws.com/fomudebipefasu/42658837775.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f7ffed8-55aa-4a29-8eb0-1bff98e2822e/jeff_cavins_bible_timeline_chart.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/32b752da-8c5d-4ca8-8a1b-29ee86ca6e28/senaseje.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b040bb3f-3ae8-453d-9850-6ab3ae1c29fe/what_is_the_grace_period_for_expired_tags_in_california.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad79f0a3-7b3e-4e14-877c-4366522350e0/pugonuzebasapav.pdfIn PDF document text
    • https://s3.amazonaws.com/juwofuxufijup/dugurelun.pdfIn PDF document text
    • https://s3.amazonaws.com/megodipewukitoj/anet_a8_plus_firmware.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_off0000f488.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF488 5408 bytes
SHA-256: 7a71492b4883189ece2051916c3b1eb3af78137788fc74425573e25468569063
font_01_sfnt_off000106d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106D3 11432 bytes
SHA-256: 603496a308acf773005555ce53635512a7d87f5f57fb90feec5b7fe5e99af749

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