Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b4d65d19e373dd8…

MALICIOUS

PDF

78.4 KB Created: 2021-03-28 15:31:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: e459ef05383a354edc51b599e7e6b9a1 SHA-1: d8786aa8a6a91694be19bfc1e167883a8dc3a26a SHA-256: 3b4d65d19e373dd8efd144d85255d72abddb7d2c0d70ea49148a2fff4c5ac37b
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable domains, suggesting a link farm used for phishing or malware distribution. The document body is heavily obfuscated, but the presence of external URIs and the overall structure strongly suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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 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.
  • 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://maypoin.ru/wix?keyword=100+oz+of+water+a+day PDF link annotation
    • http://starkrobotics.org/5th_grade_math_workbook_freeqpkim.pdfIn PDF document text
    • http://ludshop.xyz/79513226555ltn6r.pdfIn PDF document text
    • https://faxomozux.weebly.com/uploads/1/3/0/7/130775398/bd2bec70ceab.pdfIn PDF document text
    • http://wivevemeb.scienceontheweb.net/98207125714.pdfIn PDF document text
    • http://liketsven.xyz/how_to_put_hp_envy_5530_printer_onlineqprr5.pdfIn PDF document text
    • https://zanolidades.weebly.com/uploads/1/3/2/6/132695759/3882989.pdfIn PDF document text
    • https://bigimegena.weebly.com/uploads/1/3/1/4/131438437/1839299.pdfIn PDF document text
    • http://shopeuro.pro/131633632446s9f5.pdfIn PDF document text
    • http://vuvulusigi.scienceontheweb.net/can_you_see_heartbeat_at_6_weeks_5_days.pdfIn PDF document text
    • http://chaptejvxz.fun/jeep_cherokee_auto_to_manual_transmission_swap3ce9n.pdfIn PDF document text
    • https://lomofoxagut.weebly.com/uploads/1/3/4/5/134524577/3e544f91b2.pdfIn PDF document text
    • https://sufifova.weebly.com/uploads/1/3/4/7/134736026/zemexide.pdfIn PDF document text
    • https://figowemepiwe.weebly.com/uploads/1/3/1/3/131398533/7b811942100.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://49b821e7-ee7e-41b4-809b-d0417b8c1ddf.filesusr.com/ugd/927743_39b3b933c8d042439a42d76b0456d8c2.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/makumapikeze/fight_club_imdb_parents_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/selivuvumepaveb/55257124788.pdfIn PDF document text
    • https://98be45bc-63b9-4117-aff7-84a3d4f2c4a0.filesusr.com/ugd/90c678_8cfcd9e174f2462da2a5dfe1bb4f0371.pdf?index=trueIn PDF document text
    • https://da550aaf-34ae-4f9b-ad82-7836b82beebe.filesusr.com/ugd/a203e6_d02330dde4c84074b7ac5a12ef6e6e24.pdf?index=trueIn PDF document text
    • http://sudexixurijaxoz.atwebpages.com/dont_quit_poem_summary.pdfIn PDF document text
    • https://4c982f7a-b72b-446d-8c7a-5e2d6818c0db.filesusr.com/ugd/519a61_11ed57da11784f02a1c54cac8c733430.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fefurorobumi/suvuwufawononobetobexo.pdfIn PDF document text
    • https://d6aab468-caab-4d9e-910f-d3bf64ae4104.filesusr.com/ugd/5438e3_be7461949cb147ac9ee6ec4f72f1cf38.pdf?index=trueIn 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f6c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6C8 5036 bytes
SHA-256: 0942a4a066d5a5936d5dbfb2644f9b0645128693d5f00bf9b4d467931e4e915b
font_01_sfnt_off0001081f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1081F 10604 bytes
SHA-256: 7fde087cf87aae6c01ba4f785975a5cf904557811a496b44128b39fa55117b97