Malicious PDF — malware analysis report

Static analysis result for SHA-256 2bed54261366ed5c…

MALICIOUS

PDF

87.8 KB Created: 2021-03-29 09:49:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4dcae8d33e624ffbc3dc8885f0364244 SHA-1: d17d829d0d27218e63aa702c3c1fdca94234c3d3 SHA-256: 2bed54261366ed5c8706fee4183223e5bc10138d866f05c7478ed0308d164e04
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, indicating a link farm or SEO poisoning attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were extracted, the PDF structure and numerous external links are indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 6

  • 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
  • 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://ponafet.ru/strik?utm_term=krups+waffle+maker+f654
    • http://akmurzina.com/legenewirexod424c.pdf
    • http://sibatike.getenjoyment.net/22246869583.pdf
    • http://vuvodagedene.scienceontheweb.net/can_you_put_animated_gif_in.pdf
    • http://cookwellbakewell.com/cheat_engine_6._3_for_android_apkjsfau.pdf
    • http://1xbets-reg.site/simcity_4_free_download_full_game_windows_7zioj1.pdf
    • http://sokegex.mywebcommunity.org/pdf_fonts_dir_asciidoctor.pdf
    • http://bukuminuwakub.mypressonline.com/41090630601.pdf
    • http://nopezimugabotik.mygamesonline.org/present_simple_and_present_progressive_exercises.pdf
    • http://beguwidip.scienceontheweb.net/bradwell_v_illinois.pdf
    • http://bnatural.space/mojave_bootable_isoekhzj.pdf
    • http://intekzafast.online/how_to_eat_well_pregnancyx8578.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://9f503c4c-bf14-4dcb-9a7a-68e0e5bb3568.filesusr.com/ugd/8ac1ab_4eb308905b51484f8ed3b49a0a5e1ca9.pdf?index=true
    • https://41be308f-8a64-4dec-8b30-4937605be974.filesusr.com/ugd/f042fe_02e818dc311f489a94966b1391a06b79.pdf?index=true
    • https://656adf98-7a81-40bd-8d0f-2b9c27d09201.filesusr.com/ugd/268ab1_82d32180ff814654b9a751b539fbdcbe.pdf?index=true
    • https://8b5ac0f3-2bc4-49a6-9a99-2541af31b215.filesusr.com/ugd/f2ef67_71888abc3be64311a00dd512193cf6b8.pdf?index=true
    • https://s3.amazonaws.com/dudujopixejikug/kirk_franklin_christmas_sheet_music.pdf
    • https://s3.amazonaws.com/lusabifef/nupopoker.pdf
    • https://aee666f7-65d2-4416-8089-42e5bd85255d.filesusr.com/ugd/c4036c_41a952839b824b5c98968ec850a597f1.pdf?index=true
    • https://s3.amazonaws.com/fekife/didul.pdf
    • https://95c758d6-fd33-43c6-b5d0-f1f55e07e946.filesusr.com/ugd/cb0188_77bbde627b7d485b8df235e69e0df28a.pdf?index=true
    • https://711920be-b761-4f0e-a604-762b26663b16.filesusr.com/ugd/ffcbea_5cb069f897a84541a97d393af6dba842.pdf?index=true
    • https://s3.amazonaws.com/dikobepibelun/52538355160.pdf
    • https://17851959-1482-4b49-8222-7b7b0c628459.filesusr.com/ugd/3cb679_93d716fdf74d4a7383cf2e54c2ab2c1d.pdf?index=true
    • https://s3.amazonaws.com/geradi/95719730573.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_off0001020e.bin
3805af80f9e775553112806de4ef201db4a32cc6f3a3e1ab7a71352d457a5538		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1020E 5540 bytes
font_01_sfnt_off000114e9.bin
0373a6611cb145b1d58292fbc0404ce0c7f57830ef9b00c33271dc86f19d55f6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x114E9 11012 bytes
font_02_sfnt_off00013aa9.bin
ea75db71c9df7250347a03039f742fcd189f5fc3f08964e696816fa8b5227073		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13AA9 16092 bytes

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