Malicious PDF — malware analysis report

Static analysis result for SHA-256 634a0ca4ea9f1b33…

MALICIOUS

PDF

155.4 KB Created: 2021-03-15 07:12:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 95d17f101241a9f18c512c37130dec8a SHA-1: ef60f819914f27d6d261bf81ebc6b5d136842d5b SHA-256: 634a0ca4ea9f1b33b9d325c697f1a1b5463ac0bd58e0446cdd9f7fa0dce70476
126 Risk Score

Malware Insights

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

This PDF document was flagged by multiple heuristics and a machine learning classifier as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, one of which, https://xezojetit.ru/123?utm_term=c+diff+guidelines+2018+summary, is directly associated with the document's apparent lure. The document body, though heavily obfuscated, contains text that appears to be a title related to "C diff guidelines 2018 summary", suggesting a phishing attempt to trick users into clicking the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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=c+diff+guidelines+2018+summary PDF link annotation
    • https://cdn.sqhk.co/gafisasiwu/jNljfPa/spirit_runeword_paladin_shield.pdfIn PDF document text
    • https://cdn.sqhk.co/bovefonot/LytxjaE/weather_report_bihar.pdfIn PDF document text
    • http://nafarami.medianewsonline.com/27524298149.pdfIn PDF document text
    • http://wijetaz.mypressonline.com/kusamozivelobivodegutosoz.pdfIn PDF document text
    • https://cdn.sqhk.co/susojareb/g7HLHJr/50380673091.pdfIn PDF document text
    • http://melomone.scienceontheweb.net/how_much_does_nvivo_cost_for_students.pdfIn PDF document text
    • https://cdn.sqhk.co/midijanere/gejiAgg/wimilufuworogawobowufib.pdfIn PDF document text
    • https://cdn.sqhk.co/rawewosit/gdheb9I/85788561968.pdfIn PDF document text
    • http://lijonotogi.scienceontheweb.net/lepowoxivinagin.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://sasukagisodubex.onlinewebshop.net/73050349250.pdfIn PDF document text
    • https://s3.amazonaws.com/tanapilamaxi/writing_exponential_functions_given_two_points_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a3ac351-c285-4953-be81-7b1a92761eab/sodelenizisapunigo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/95e34f04-396c-4fdd-8ec3-688d94d3e1d5/modern_brush_calligraphy_font_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/df62ed72-96b5-44da-9eba-ac22afda1849/64005197339.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/03151c33-3b72-4289-a659-2e950ec4f059/zoxinemixalobis.pdfIn PDF document text
    • https://b5f169ef-6bcf-4d19-a24b-32bdc9dd7a5f.filesusr.com/ugd/2e79a6_3643abdde1334182ac8014d0a2b9e0ae.pdf?index=trueIn PDF document text
    • https://48bf584d-d56c-45cf-b4f3-c1c05dce5274.filesusr.com/ugd/3f4b99_3fe2e84a039044d1a93301d82bf47b50.pdf?index=trueIn PDF document text
    • https://ce419959-236d-4487-89d7-67f356bda573.filesusr.com/ugd/147b51_ac31aee00eb44704b14783a80291f7f1.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9bae18c8-1f26-4c96-baa0-8a48708f34fb/the_original_play_phone_through.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5fe03366-9cd0-4c9d-a85e-98eaea4172bd/hayward_pool_heater_propane_pressure.pdfIn PDF document text
    • https://3f46bf15-0a8c-4e80-b3e5-a2e3bf90e008.filesusr.com/ugd/8e6e76_3164d7ed70664352816ed8b9ed672b20.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xozeb/4081764825.pdfIn PDF document text
    • https://b5526579-b22d-45a0-8251-9885a72cf3eb.filesusr.com/ugd/0cd019_5ba414b7e11a43b39329dbad5e5d1d2b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7c28053-3127-4632-ada6-72b1931d38f4/iphone_5c_price_in_amazon.pdfIn PDF document text
    • https://s3.amazonaws.com/batiku/11680646313.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00021437.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21437 5564 bytes
SHA-256: 27d4a0e04aceb917937dec341246cbf60d2073daece36469dcb6b53cb61b9777
font_01_sfnt_off00022706.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22706 12172 bytes
SHA-256: 1ef5b036e12b93886b73de9234d5bc17b3a8c5b2dcdb4560f0452b98658fba28
font_02_sfnt_off00025075.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x25075 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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