Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e25d85428fa373c…

MALICIOUS

PDF

80.0 KB Created: 2021-03-21 05:08:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8d5c974a848f6b81655c8f653a9ff3f3 SHA-1: 90638db65f98a14e1b827254b636197043acadbf SHA-256: 3e25d85428fa373ca81a93b852bb583303985bfb0e42a83c5f9372e71f2b9dfe
156 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing attempt. The primary external URL observed is https://ponafet.ru/123?utm_term=reporting+arrangements+definition. While no scripts were explicitly extracted, the presence of numerous external links and the ML classifier's high confidence score indicate malicious intent, likely related to directing users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://ponafet.ru/123?utm_term=reporting+arrangements+definition
    • https://nezodutulep.weebly.com/uploads/1/3/4/8/134883135/bopidow.pdf
    • http://lazadacostumercenter.com/what_does_a_black_dog_mean_in_a_dream_in_islamio5s1.pdf
    • https://mafojavakafox.weebly.com/uploads/1/3/0/8/130814343/pamefozuj.pdf
    • https://velonifiwivuli.weebly.com/uploads/1/3/0/7/130739758/pubaxoduriteribedup.pdf
    • http://good-production20.site/is_diary_of_a_wimpy_kid_a_ar_book5pxud.pdf
    • https://jetovalanowu.weebly.com/uploads/1/3/0/7/130739462/2673858.pdf
    • https://petenugilamabo.weebly.com/uploads/1/3/1/4/131453278/4405235.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/benuka/89648830493.pdf
    • https://uploads.strikinglycdn.com/files/a691ade8-df0a-420f-a0c0-d8f4f162e8dd/abu_garcia_pro_max_10.pdf
    • https://s3.amazonaws.com/vebogotexaf/baby_have_been_calling_song.pdf
    • http://razivud.epizy.com/how_to_swing_a_baseball_bat_fast.pdf
    • https://uploads.strikinglycdn.com/files/c88f1cc9-2609-4bcb-8767-93b99ceae0cb/diferencia_metal_gear_solid_2_substance_vs_sons_of_liberty_ps4.pdf
    • http://gakifok.rf.gd/arabic_translator_app_free.pdf
    • https://s3.amazonaws.com/woxotopapozokev/19287861773.pdf
    • https://s3.amazonaws.com/xedewofuretujo/guided_path_counseling_sheboygan_falls.pdf
    • https://uploads.strikinglycdn.com/files/b117a01b-2a6b-4574-a40a-f30a09e1f175/how_do_you_remove_a_whirlpool_freezer_drawer.pdf
    • http://roparewuna.rf.gd/armenia_tourist_visa_application_form.pdf
    • https://s3.amazonaws.com/fejakixoweka/bidadari_tak_bersayap_anji.pdf
    • https://uploads.strikinglycdn.com/files/368a89f1-902e-458b-bc90-348a8a2fe7b4/stoeger_m3500_choke_for_duck.pdf
    • http://jamiwurono.epizy.com/where_can_i_drop_off_used_clothes_for_donation.pdf
    • https://uploads.strikinglycdn.com/files/48e20394-67b4-4183-a5e8-d74ed6335b66/zefifez.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_off0000ef37.bin
98b6110eac7f8a874a6c3e8dfdabbb4b6ca70651128f07ee2127019054c1fd11		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF37 5124 bytes
font_01_sfnt_off00010090.bin
1aef038aacbf25b56b981203c3352340c71e39f88a91a2bd353f1892c0a0e972		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10090 10524 bytes
font_02_sfnt_off00012469.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12469 4324 bytes

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