Malicious PDF — malware analysis report

Static analysis result for SHA-256 888a2a759dfb0290…

MALICIOUS

PDF

73.7 KB Created: 2021-04-08 09:44:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 82d5afcaa0adcd4f002aec927b374ae9 SHA-1: 04955054d62fbd96cb2f3785d6176abd808303fb SHA-256: 888a2a759dfb02901052ffc3e835b08d42a90d43f0c688277d1d76ad2e7cf3f1
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a significant number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to potentially malicious sites. The presence of a URL with a 'utm_term' parameter implies a targeted campaign, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://pelibifir.ru/strik?utm_term=philips+universal+remote+apple+tv PDF link annotation
    • http://fezufizibum.mypressonline.com/black_mirror_be_right_back_script.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369904/normal_600be55e7a910.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388629/normal_60461b060bc65.pdfIn PDF document text
    • http://idealslimitalia-official.site/seiko_-_solar_chronograph_divers_200m_black-green6nn2s.pdfIn PDF document text
    • http://fumuroruzej.medianewsonline.com/statistical_learning_python.pdfIn PDF document text
    • http://sait-ok.ru/girl_from_ipanema_lyrics_translationseeus.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500446/normal_5ff8fcee7f1e8.pdfIn PDF document text
    • http://liko-sneakers.com/35765062448txnqv.pdfIn PDF document text
    • http://zijixiteluwek.scienceontheweb.net/bertrand_duopoly_model.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://73856814-13bb-4d44-aeaf-752cce6ba6bd.filesusr.com/ugd/a0d21a_9f6b50dee788448b9ee6210d045c5950.pdf?index=trueIn PDF document text
    • https://a134ef9b-a212-4d8e-a35f-da3d896bbd40.filesusr.com/ugd/dadc92_6c0d7b21853d47b98856b86089c333b5.pdf?index=trueIn PDF document text
    • https://afa032df-bfad-47da-a9c8-c79260182993.filesusr.com/ugd/6f9b04_95470ff895f342cd9ca74f4f4ad6b10a.pdf?index=trueIn PDF document text
    • https://b913155d-2712-4fd4-bcc6-651970a8c456.filesusr.com/ugd/e39924_511ca6cd8efa45148ecaf3cd7ec4cf46.pdf?index=trueIn PDF document text
    • https://969948a0-d7f7-4827-958e-a3856fee42d4.filesusr.com/ugd/9d40bc_5d3665f2ef724b88a57aab45cc95e6e9.pdf?index=trueIn PDF document text
    • http://gakajitaju.atwebpages.com/what_is_the_main_criticism_of_differential_association_theory.pdfIn PDF document text
    • https://b5c90759-dbf8-4ccd-b12d-e23c958527f9.filesusr.com/ugd/915a55_520d53b660184454a2776b71f93a3e7d.pdf?index=trueIn PDF document text
    • https://6440a9f6-5e82-4153-977b-4ffe9374ec4a.filesusr.com/ugd/7182f3_e86cea64cad542f3b32c4c72337919b7.pdf?index=trueIn PDF document text
    • https://6d251753-49d0-4f5b-a278-10ed1cacc9d0.filesusr.com/ugd/5c139a_e88a11c3ec46467e8b23c92f0c271687.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_off0000e4e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4E8 5120 bytes
SHA-256: c79c07bfd4c3d2adfd0ec24029daf3cf935444378acd1513018acd84decb2c88
font_01_sfnt_off0000f62c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF62C 10336 bytes
SHA-256: b8bfb83a7bc26e524eb3a66ccb531120bef1c6c8ba22cca5c2d1e4296f29bb38