Malicious PDF — malware analysis report

Static analysis result for SHA-256 0caa11db223c4585…

MALICIOUS

PDF

82.7 KB Created: 2021-04-03 20:49:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 57eb5272bcb072ddb1e372b2839004d3 SHA-1: 05405c2e4865feec3164027f8ac94ba90f242eb0 SHA-256: 0caa11db223c4585a8d7660dd08fc9a1778a70536403ca5441d505cbd44e41d0
96 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The embedded URL points to a suspicious domain and is presented in a context suggesting a lure for downloading an Android APK, which is a common phishing tactic. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to trick users into downloading further malicious content.

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://vilenefex.ru/123?utm_term=factory+reset+android+phone+apk PDF link annotation
    • http://kinokaiff.space/lilijelzog2b.pdfIn PDF document text
    • http://muzhskoizhurnal.ru/50813627512putyx.pdfIn PDF document text
    • http://2gusevshop.space/game_battle_warship_naval_mod_apk3tgf3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407552/normal_603e2bd20aa29.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426971/normal_60195866d414a.pdfIn PDF document text
    • https://cdn.sqhk.co/wanadujogo/ihbidjb/19189299611.pdfIn PDF document text
    • https://cdn.sqhk.co/guwaloxipete/otNc3lY/antonio_brown_number_patriots_uniform.pdfIn PDF document text
    • http://topplafond.xyz/wekakadapetekenasoxazalet3wpdx.pdfIn PDF document text
    • http://allerlo.xyz/xelojupepukonuzitzohnw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zomumadunita.rf.gd/4th_grade_math_word_problems_worksheet.pdfIn PDF document text
    • http://xixakoju.rf.gd/sifupolijuvemupidodov.pdfIn PDF document text
    • https://s3.amazonaws.com/wexukufedepim/how_to_order_rose_bushes.pdfIn PDF document text
    • https://s3.amazonaws.com/divikufifir/1973534907.pdfIn PDF document text
    • https://s3.amazonaws.com/vexosafugunu/what_jobs_can_you_get_with_international_business_degree.pdfIn PDF document text
    • https://s3.amazonaws.com/tazopaju/banished_colonial_charter_1._4.pdfIn PDF document text
    • https://s3.amazonaws.com/satuja/exercise_during_pregnancy_guidelines.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c553bf4-2d2c-47fc-a296-74099b002070/vivato.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b69c4763-9dcb-48fe-becc-9e14d5212f5b/how_to_change_battery_in_accu_chek_performa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/457a8c21-c372-42e9-971c-46706f0608a5/7635003332.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_off00010328.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10328 5248 bytes
SHA-256: 1d72009fcfa3ac5a54d6fb7dfdf2550391aae0b43a350afc236cb04bda5c34f8
font_01_sfnt_off0001150b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1150B 11304 bytes
SHA-256: 6067b32917216d1b5d2cdd10d2a3eaddce31a2191a72670567204926afe62fd1

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