Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f7186a727b9c119…

MALICIOUS

PDF

68.0 KB Created: 2020-12-07 12:58:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 0e381350deb854142d2b48162c45187a SHA-1: d0e1519888063255ee3e9a07a25e61a3d361ecbc SHA-256: 3f7186a727b9c1193e10f47ebfe76af46e7f5903bd84d7ce41d6b6af71877168
96 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, with a high risk score. It contains an embedded URI pointing to a suspicious domain, likely intended to redirect the user to a phishing or malware distribution site. The document body, though heavily obfuscated, contains text related to 'Knox county register of deeds nebraska', suggesting a pretext for the lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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://traffnew.ru/123?utm_term=knox+county+register+of+deeds+nebraska PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4369168/normal_5f87af836dec2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487200/normal_5fc5aff325610.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383804/normal_5f8d9f473abcd.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/lokijuronig/loramexewa.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbdf50a9b1ed035389fe4b1/1606284555611/1984_hate_week_poster.pdfIn PDF document text
    • https://s3.amazonaws.com/mexijegedakol/bakabutuvoxavefezegapakas.pdfIn PDF document text
    • https://s3.amazonaws.com/tipikaxe/29408550878.pdfIn PDF document text
    • https://s3.amazonaws.com/gurafoga/fenofegezupa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0c00ff1-8898-4afc-8be5-7e0da38d2b2c/hello_granny_apk.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc2fe30abaecd33182fe85c/t/5fcd9e1b7ae85b53b2ad7bbe/1607310889053/switched_at_birth_movie_2020.pdfIn PDF document text
    • https://s3.amazonaws.com/lupebesu/antartida_rounded_free.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_off0000c9d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9D0 5500 bytes
SHA-256: 29f4852a1ff47ddb1b12cb7c5fa7457c9fcf38e0f102e5f77683ff0a857134fd
font_01_sfnt_off0000dca4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCA4 10792 bytes
SHA-256: 70d26cd014523b132a74f43f991ec0f4fa84db2f6842aac4934674fe9266b08c