Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4557a5477cdc736…

MALICIOUS

PDF

67.8 KB Created: 2020-12-22 09:33:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: ae3716848dc4fcb250c954eb1db1a4eb SHA-1: e14edc5adc296a288292040deb6f1de901dab263 SHA-256: b4557a5477cdc7361946ded35f8b07cf8e83ebe8574073ce9faa5551309695aa
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains an embedded URL pointing to a suspicious domain, identified by heuristics as an external URI and flagged by ClamAV as a phishing trojan. The ML classifier also strongly indicated maliciousness. While the document body is heavily obfuscated, the presence of the external URL strongly suggests an attempt to redirect the user to a malicious site, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://trafftec.ru/strik?utm_term=word+pets+free+word+games PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4389606/normal_5fd2a4c853592.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc6751d27a199023adb75cf/t/5fcfa6bb8b174454e9a8e8bc/1607444158265/mikixakiduv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cbddffb9-9487-40d6-8223-d86bb6c159c2/flowmaster_super_50_tundra.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c20f7cc-5788-4a33-a66c-b3cb642982d5/jugav.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/17863f18-c7fb-4a83-bcda-e0155f261a3c/pabifopumikuwur.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/129e32ac-ea08-4674-bfbd-0350ddf1c305/victor_parks_and_rec.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc2b6d9e2fce462bc97aa53/t/5fcd56518a55f2188b8836a4/1607292498155/among_us_play_on_pc_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/53d3767e-b2a5-4ca9-ba62-116d7c4242e4/nadosojulovibabofeva.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc724bad64a3343a5f7119e/t/5fc844e5094cf7617dbaedba/1606960357749/65119126725.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fdfd930ff074777c9861b5f/t/5fdfe1cd2baf317dc3b6d8a0/1608507854515/burnham_boiler_parts_manual.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fdfcd3607af9e0e1603aa2b/t/5fdfe68cef8e407a9eb57c20/1608509070275/di_water_safety_data_sheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f907c288-558b-4660-bd44-67637d548751/cookie_cat_steven_universe_recipe.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc1cdd0ec917750a3de3367/t/5fd0378a51357b44bb89adf6/1607481231101/status_video_tamil_download_for_whatsapp_sharechat_funny.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_off0000cde6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDE6 5432 bytes
SHA-256: 1043780e5fbd1384080c2297d734090893d27ec3e9269eaea77aa545ca52cdfe
font_01_sfnt_off0000e06b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE06B 10076 bytes
SHA-256: 7337795e13421a6687c4311da5b8875a0217c2c773add6259f14ed2a789ae2a7

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