Malicious PDF — malware analysis report

Static analysis result for SHA-256 b734d629269b7f40…

MALICIOUS

PDF

84.5 KB Created: 2021-03-19 07:44:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 07e2f9557a8db2ed5799f5231a4cd689 SHA-1: bca94e5d71e0a794d7a5e8701c41d7cbbfdb2c21 SHA-256: b734d629269b7f40ad4333a52b8c4af7a62fdee03a1a367705607ad914e0fa9b
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically pointing to 'https://yafferge.ru/'. The ML classifier also strongly flagged this PDF as malicious. While the document body is heavily obfuscated and unreadable, the presence of malicious URLs indicates an attempt to redirect the user to a harmful site, likely for phishing or to download a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://yafferge.ru/123?utm_term=enterobacteriaceae+and+coliforms
    • https://cdn-cms.f-static.net/uploads/4377933/normal_603cb8bf25834.pdf
    • http://golixudib.mypressonline.com/lewader.pdf
    • http://walolexokesufa.sportsontheweb.net/medenomomojatovufizemijo.pdf
    • http://sallles.ru/what_was_maya_angelou_childhood_liked9wn1.pdf
    • http://beviluxenumiliv.mywebcommunity.org/82707797209.pdf
    • https://static.s123-cdn-static.com/uploads/4495839/normal_5fca2eb834fc9.pdf
    • https://static.s123-cdn-static.com/uploads/4462368/normal_6007255794257.pdf
    • https://static.s123-cdn-static.com/uploads/4451227/normal_6000315867ddc.pdf
    • https://cdn-cms.f-static.net/uploads/4366009/normal_60348adbe479b.pdf
    • http://pressit.space/37289592820d9pk4.pdf
    • https://cdn-cms.f-static.net/uploads/4496360/normal_6021f4a1b229c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/930043d2-acf3-45c9-ae52-36c9ec5fbf80/what_is_the_disease_als.pdf
    • https://ebc1add8-0b9d-418e-9e4a-1e287827e933.filesusr.com/ugd/ab63e3_64bae4f60617407ab281986b24a248bd.pdf?index=true
    • https://uploads.strikinglycdn.com/files/0d544bf9-9884-4edb-9e48-3f4755072740/list_of_books_by_orhan_pamuk.pdf
    • https://9387bd13-3746-4408-b474-2867f26e464d.filesusr.com/ugd/ace02d_edba056e95db4841b068b5b1d0033606.pdf?index=true
    • http://xufoziminep.onlinewebshop.net/cabinet_making_manual.pdf
    • http://zijedan.atwebpages.com/economics_lesson_plan_high_school.pdf
    • https://uploads.strikinglycdn.com/files/615fbcc5-b8c6-4f71-929d-0aba507ea1e5/sodemadoweka.pdf
    • https://27420876-d215-4860-9a72-f48db0d0c320.filesusr.com/ugd/4062c2_8569dce94e2c4790abafde3a041d22ff.pdf?index=true
    • https://uploads.strikinglycdn.com/files/e475b996-d0d8-4b1a-b50a-fb36315acdf5/mitologia_griega_y_romana_libro.pdf
    • https://ff0b3df2-dc61-4aeb-9024-93fa9b5bc175.filesusr.com/ugd/aa14a9_e5a89223548e48b9b22fb598a1b35a05.pdf?index=true
    • https://uploads.strikinglycdn.com/files/05fd7f54-73a4-4e9e-bc4a-d270ade3211d/cuisinart_pro_custom_11_model_number.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f679.bin
c8be9dd0d4b8afc42306ca6d069491a62ca52d17f88f0336a7184fd5f8364f72		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF679 5264 bytes
font_01_sfnt_off00010848.bin
30cdb8f697f1a748941ed5bd147dc6fc870d782a43d9b8b4a4c9a35068324da1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10848 11384 bytes
font_02_sfnt_off00012f35.bin
e062faff0b5f3d12ef96d17a813e209689a07cec8984531399442ab350abe39b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12F35 16136 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.