Malicious PDF — malware analysis report

Static analysis result for SHA-256 2108278f7bb5441c…

MALICIOUS

PDF

95.8 KB Created: 2021-03-11 08:57:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: e45b015e3b5f7e11324aae7f1531c6d4 SHA-1: a6511e064001512763e6bb228462c4eb67a7857b SHA-256: 2108278f7bb5441c7839f01552c526ea66ee042fea193bd569052aa759816fe6
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with a critical heuristic firing indicating a link to known malicious redirector infrastructure. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains references to file operations and application names, suggesting it may be a lure for a phishing or malware download attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/strik?utm_term=write+list+to+text+file+python+3 In PDF document text
    • https://cdn.sqhk.co/susojareb/RhbPJJt/khan_academy_eureka_math_5th_grade.pdfIn PDF document text
    • http://prizinsta.info/what_is_a_medium_sized_sweet_potatozvb6a.pdfIn PDF document text
    • http://tibetterrier.ru/mofalumeneku9joyh.pdfIn PDF document text
    • http://kizexibos.iblogger.org/can_you_use_salicylic_acid_on_your_scalp.pdfIn PDF document text
    • http://copyrightmediahelp.com/ps4_gta_v_download_codemd6ju.pdfIn PDF document text
    • http://gadezobokonej.iblogger.org/golden_background_template.pdfIn PDF document text
    • http://macsk.space/logitech_harmony_ultimate_one_touch_screen_ir_remotelrse4.pdfIn PDF document text
    • https://cdn.sqhk.co/navotezive/IUeijhe/classic_marble_granite_memphis_tn.pdfIn PDF document text
    • https://cdn.sqhk.co/zuxolusufa/ggbBja5/gigomeperigiwizajib.pdfIn PDF document text
    • http://pasendapp.online/chicago_bears_2017_scheduleof9qm.pdfIn PDF document text
    • http://dibubewivutuva.22web.org/14015423309.pdfIn PDF document text
    • http://bumisemi.iblogger.org/philosophy_of_computer_science_definition.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://leragirifodoz.rf.gd/58661872058.pdfIn PDF document text
    • http://jeduxotikeg.rf.gd/2005_honda_accord_oil_change_reset.pdfIn PDF document text
    • https://s3.amazonaws.com/pobixedele/xedezabozofebogivu.pdfIn PDF document text
    • http://dararexirebugus.epizy.com/bluedio_hurricane_manual.pdfIn PDF document text
    • http://jegepifewomu.epizy.com/mujezapik.pdfIn PDF document text
    • http://mipuvofelope.epizy.com/71600179234.pdfIn PDF document text
    • https://s3.amazonaws.com/xebuvuwov/10149160418.pdfIn PDF document text
    • http://legofovivaxom.epizy.com/36735954151.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000113c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113C8 4912 bytes
SHA-256: 9088c55f426b8361a3b5e4c8498e1b4d0bd177518b8599edff62359881a98e9e
font_01_sfnt_off0001248c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1248C 12548 bytes
SHA-256: 96c1a24d6b5eaa0be6a7c64eb60079185b1c5fc546abadbd5bad665a9ea68c23
font_02_sfnt_off00014ed2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14ED2 16084 bytes
SHA-256: 12e1bdea5fc73f205daff8bbc4573b4c6e5ba94205cf5b3440f65e61b625f0f0
font_03_sfnt_off0001637f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1637F 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2