Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8827cbe235e98ac…

MALICIOUS

PDF

83.6 KB Created: 2021-04-07 21:58:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 173fcf0838d6d9817ed4480e12d3c8bf SHA-1: e2a16f7cdb15f49e052f4fee2f0f624800cfde61 SHA-256: c8827cbe235e98acc6fa00ea503ad3d3cd92140b1cbd1dc0dada32327ccb56a7
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a machine learning classifier and ClamAV, indicating malicious intent. It contains a large number of embedded URLs pointing to various domains, suggesting it functions as a link farm designed to redirect users to potentially harmful sites. The presence of 'utm_term' parameters in some URLs indicates a phishing or tracking attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://xezojetit.ru/123?utm_term=maplestory+m+guide+weapon
    • http://feludekinopotas.scienceontheweb.net/18012949768.pdf
    • http://2220202.ru/sysmex_xn-350_operators_manualhkk4a.pdf
    • http://zabemaladameg.medianewsonline.com/80349138637.pdf
    • http://pozufopajosel.mypressonline.com/52251079972.pdf
    • http://clipshd.design/what_are_the_four_nitrogen_bases_contained_in_dna84xa9.pdf
    • https://livaganomin.weebly.com/uploads/1/3/4/3/134399079/8367062.pdf
    • https://maninidepot.weebly.com/uploads/1/3/4/7/134702581/306a537cca7d334.pdf
    • http://gamuxiwami.getenjoyment.net/7732458770.pdf
    • http://verification-help.com/24410678950jsst5.pdf
    • http://lobabinuladeri.medianewsonline.com/pofebi.pdf
    • http://segwaywheelchair.ru/google_sheets_custom_function_not_updating1leao.pdf
    • https://vifunufuwo.weebly.com/uploads/1/3/4/5/134596702/784ce.pdf
    • https://futafapegimato.weebly.com/uploads/1/3/1/8/131855997/8428923.pdf
    • http://mibebar.22web.org/pemozakus.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/68affdc2-9f43-4373-808e-0b202a0f8eca/nixipemidoromo.pdf
    • http://vagowezu.epizy.com/64995408359.pdf
    • http://mebapuperepomuv.rf.gd/what_is_an_example_of_a_solution.pdf
    • https://uploads.strikinglycdn.com/files/10b7e969-3730-4312-848c-b1b37a986611/pujiduboxefazesatu.pdf
    • http://pozijirume.rf.gd/ffc_stands_for_answer.pdf
    • https://uploads.strikinglycdn.com/files/56bfc78c-671e-49a1-968f-e2a1617a545f/ms_excel_2013_tutorial_sinhala.pdf
    • https://uploads.strikinglycdn.com/files/11a30e2a-9803-4875-b98d-4218d427bc82/nagedezemimex.pdf
    • http://pevipitoz.atwebpages.com/how_to_read_a_birth_chart_zodiac.pdf
    • http://forezepolutaju.onlinewebshop.net/wj-iv_achievement_subtest_descriptions.pdf
    • http://dilemewenebuzur.rf.gd/los_13_signos_teatrales_con_definicion.pdf
    • http://zitadufafasid.onlinewebshop.net/what_does_william_afton_look_like.pdf
    • http://naburonip.myartsonline.com/fodizoroziligoxiviwazun.pdf
    • https://uploads.strikinglycdn.com/files/55cb62dd-5ed8-4a5f-94e5-ea93d1765188/can_you_keep_a_secret_streaming_english.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_off0000f223.bin
ad6ab51262d1354ab4a5c546391da1ff1085b6766e98f692525c25451f3cfce5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF223 5480 bytes
font_01_sfnt_off000104d2.bin
76cb9704885fdc221b8ab3e6a2f2e361101c0f84a33084caf432b6a214f6ef3b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x104D2 11068 bytes
font_02_sfnt_off00012ae4.bin
532315dfdc59b350d447ad91845dd8cc72a836e684f536ab9a4305dc5b53fb8e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12AE4 16204 bytes

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