Malicious PDF — malware analysis report

Static analysis result for SHA-256 43dfafaee27cc85c…

MALICIOUS

PDF

89.6 KB Created: 2021-03-21 20:49:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b5a686cd708ae0602d3db1b90d0e60d2 SHA-1: 96001e06b5ed1b73267f5896ef2a02bf76745dd7 SHA-256: 43dfafaee27cc85c760bc002852c1a5c1d5366824652e89cb501505718811812
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains a large number of external links, suggesting a link farm or phishing attempt. The primary malicious URL identified is https://bologen.ru/wix?keyword=yummy+ornek+cumle, which is likely used to redirect users to further malicious content. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://bologen.ru/wix?keyword=yummy+ornek+cumle
    • https://mifepomaxa.weebly.com/uploads/1/3/4/8/134897651/petagel-sujixugaxivu-biguwakopo.pdf
    • http://xunetokawetik.sportsontheweb.net/getezizepekasopezugobef.pdf
    • http://xubajur.mygamesonline.org/aprender_frances_libros.pdf
    • http://vipimuxatomefi.medianewsonline.com/98697450201.pdf
    • https://ruxevikupasej.weebly.com/uploads/1/3/4/6/134663562/wagufagovufete.pdf
    • http://dosijefa.mypressonline.com/how_does_globalization_affect_intercultural_communication_example.pdf
    • http://tafugegajotu.mygamesonline.org/linear_and_nonlinear_functions_worksheet.pdf
    • http://jesibijifinuz.mywebcommunity.org/wukofidemivude.pdf
    • http://wijuviniwak.iblogger.org/happy_manila_new_song_djjohal.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://5de6e22f-064f-4859-b003-4eaa502c5056.filesusr.com/ugd/2609e6_2145e67ddea74b40af838b8a18890a09.pdf?index=true
    • https://368051e9-4199-40ea-b9a2-dc6e6f83cb3b.filesusr.com/ugd/6260fe_a1a695e0c6784151812da210e26dc039.pdf?index=true
    • https://ca30e0e0-ecf2-44ab-b6a2-fe26291458be.filesusr.com/ugd/34e21e_f1cf306df7464c3fa2822d6fdc7b8c3f.pdf?index=true
    • http://merapuw.epizy.com/invitrogen_cell_counter_manual.pdf
    • https://uploads.strikinglycdn.com/files/d5ca46c3-49c1-4ee1-ab98-7ce7755842a3/where_to_find_shovel_links_awakening.pdf
    • http://mifofoxidil.onlinewebshop.net/21513008307.pdf
    • https://uploads.strikinglycdn.com/files/42138907-4820-4303-b2dc-3ee1686f22b2/volaxoxukesukabiwim.pdf
    • https://uploads.strikinglycdn.com/files/229c4e19-4a0b-4b7c-9926-df29608354da/historia_de_la_bandera_de_mexico_resumen_para_nios.pdf
    • http://xekabotiwuker.atwebpages.com/50646041462.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_off000113e5.bin
dfa527426d836c67943c6d3bb192658ab49ca90d0130fc43bb35b424feb6e1b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x113E5 4436 bytes
font_01_sfnt_off000122dc.bin
8f2d3b301effb3297660d1f5409b55d01312d065d91ef73ef0ddeb89eb7ba79c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x122DC 13540 bytes
font_02_sfnt_off00014c89.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14C89 4324 bytes

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