Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f7208c37438417e…

MALICIOUS

PDF

80.3 KB Created: 2021-04-03 05:49:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 939eb59b91425b7f4670e0d5c6e48fe1 SHA-1: c07c887a211c568b07584cdfbf95cf92e4d54311 SHA-256: 5f7208c37438417e1e0d925c008bb1bfdbce8715cb986055d9bbcad909eff560
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with at least two pointing to known malicious redirectors and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The document body is heavily obfuscated and appears to be junk data, suggesting the primary function is to host malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://yafferge.ru/strik?utm_term=spring+framework+5+pom.xml In PDF document text
    • http://maturibcgj.space/pudevisarpwy78.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473916/normal_6056ceb92b93f.pdfIn PDF document text
    • https://cdn.sqhk.co/jogekiluse/jsbiihi/35343898479.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445742/normal_6027863fd64cc.pdfIn PDF document text
    • https://cdn.sqhk.co/rifusofuwedi/jho8tja/24430461162.pdfIn PDF document text
    • http://thehensleys.org/mejafovijakakoranavkk3e9.pdfIn PDF document text
    • http://tosemimorov.22web.org/kinibijala.pdfIn PDF document text
    • https://cdn.sqhk.co/gizukakom/i2RphgP/driving_school_simulator_mod_apk_android_1.pdfIn PDF document text
    • http://igcopyrightverify.com/dololazefosad50nmu.pdfIn PDF document text
    • https://cdn.sqhk.co/tekunipifob/t99iaid/12474760219.pdfIn PDF document text
    • http://axecheat1.xyz/child_mental_disorders4xwl6.pdfIn PDF document text
    • http://idealica-italiauficiale.website/51154226027xt42f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fidetilodekaser.epizy.com/xewege.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae040841-9d5c-4dc8-9ff6-fc00b7c2bd41/gitolaredugebaw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ae8c333-2cb5-4acd-8f79-c7a2a84a25fa/31770728927.pdfIn PDF document text
    • http://jopavufugas.epizy.com/anthropology_syllabus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b179723-3f55-49dd-af33-21c116e8d5ad/92587804314.pdfIn PDF document text
    • https://s3.amazonaws.com/jaxesabi/vinarutewebigusabene.pdfIn PDF document text
    • https://s3.amazonaws.com/sazixipame/tiguxakido.pdfIn PDF document text
    • https://s3.amazonaws.com/wuxupewu/top_android_games_mod.pdfIn PDF document text
    • https://s3.amazonaws.com/gozifep/american_harvest_snackmaster_dehydrator_2400_manual.pdfIn PDF document text
    • http://bovilosewopu.epizy.com/taduzab.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb38d403-a09c-4df7-8811-a7a3ab4ea83d/pubuvafenuxoziwalozez.pdfIn PDF document text
    • http://davojuke.epizy.com/listview_adapter_class_in_android.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_off0000da43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA43 5528 bytes
SHA-256: e06d49fc00a9dc86937e18e4c522a64ea6a45dcdc15004d9812d9b6a0b7f2d0d
font_01_sfnt_off0000ed1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED1B 1800 bytes
SHA-256: 6d2a3a16cc464ce72cf05976c7f96a31c93af2202e0dc760c37a694345e222ee
font_02_sfnt_off0000f5ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5AB 11904 bytes
SHA-256: e5978b1dfe4b54ea3d0145780715c289e72372df13ddcdda2358a7f7924d7fd2
font_03_sfnt_off00011e04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E04 16060 bytes
SHA-256: 503f5200e83b189a546b6c6e1d808633a9135186956fe76ff9bd78de3d91e3c6