Malicious PDF — malware analysis report

Static analysis result for SHA-256 1109ed55431b94aa…

MALICIOUS

PDF

79.6 KB Created: 2021-03-24 15:25:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b5bb65ccd009bb6ce8860b5b656e6e52 SHA-1: d45cf6e605fd323a083a95fccd34e23442852573 SHA-256: 1109ed55431b94aaac9772f5d0e0dbc0995d8ea28e172cbe96830a1d62b3e543
96 Risk Score

Malware Insights

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

The sample is a PDF document identified as malicious by ClamAV and an ML classifier. It contains an embedded URI pointing to 'dafemum.ru', which is likely part of a phishing or malware distribution scheme. The document body, though heavily obfuscated, appears to be a lure related to technical manuals, aiming to trick users into visiting the malicious URL. No scripts were extracted, but the presence of embedded URLs and the nature of the detection suggest an attempt to redirect users to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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/wix?keyword=harvest+right+scientific+freeze+dryer+manual
    • https://cdn.sqhk.co/firavibaw/y2F3Ujd/school_teach_learn_english.pdf
    • https://cdn-cms.f-static.net/uploads/4369626/normal_602b4fcbc1949.pdf
    • https://cdn-cms.f-static.net/uploads/4463810/normal_6051c7e3b19f8.pdf
    • https://cdn.sqhk.co/xusarukave/y8gcjao/tolisaparotujapole.pdf
    • http://jofijuke.22web.org/arundhati_movie_tamil_hd.pdf
    • https://cdn.sqhk.co/meduxemij/ic0hj1D/pc_build_simulator_android_mod.pdf
    • https://cdn.sqhk.co/zuvaworizon/egdFjhp/easy_cake_decorating_ideas_with_icing.pdf
    • https://cdn-cms.f-static.net/uploads/4481168/normal_60341b6572a3c.pdf
    • https://cdn-cms.f-static.net/uploads/4367938/normal_5fd7af9f44281.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/0a937e41-c589-4d96-b36a-9e64fb7f2806/digital_marketing_courses_in_pune_hadapsar.pdf
    • http://diruxepuf.epizy.com/88558036037.pdf
    • https://uploads.strikinglycdn.com/files/b6352ef8-0927-4df9-a122-6c7c1519099c/65098512336.pdf
    • http://rivubutapadagar.epizy.com/whirlpool_ixelium_induction_hob_manual.pdf
    • https://uploads.strikinglycdn.com/files/3b139762-80a9-4d50-aee7-d605e023d0fa/ms_project_pour_mac_os_x.pdf
    • https://uploads.strikinglycdn.com/files/46e4370d-424c-47b7-ac11-d9503cdad3dd/43422901148.pdf
    • https://uploads.strikinglycdn.com/files/680a0597-9311-4826-bc66-d3bc4246f91f/32827916359.pdf
    • https://uploads.strikinglycdn.com/files/eab48c31-4cc7-4082-8c89-4da3bc48d5da/jitegifasa.pdf
    • https://uploads.strikinglycdn.com/files/48e2e87b-f489-4fdd-8050-b116d87db70c/wilitejuxasupubu.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec57.bin
b54934f87a67b78625573e1d30c6fedc869998bd2c3ea0b27e478ed3bea8cabb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC57 5380 bytes
font_01_sfnt_off0000fe84.bin
a5a92f091c9fe0de6751a496fd97399c3d911ee27fc0200a5139c9ea9a789d15		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE84 10580 bytes
font_02_sfnt_off00012282.bin
ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12282 4324 bytes

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