Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f3f54176469efe0…

MALICIOUS

PDF

87.3 KB Created: 2021-02-11 20:11:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 1eb6b894840808816763cc5fb9a541a0 SHA-1: d27e8708e46fbec95b03c34fb2c30a2728050158 SHA-256: 0f3f54176469efe0ce990b9fee7d1e1eba9185d7fb9049c59758578e7ec65b04
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with several pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated, but the presence of links and the heuristic firings suggest a lure to external, untrusted sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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/123?utm_term=maddie+poppe+and+caleb+break+up In PDF document text
    • https://panikelixiguju.weebly.com/uploads/1/3/4/4/134478359/rifedonavot.pdfIn PDF document text
    • http://pek-24.cc/dreamline_shower_doors_parts4quv9.pdfIn PDF document text
    • http://fartook.online/arc_hydro_groundwater_tools_freel57ng.pdfIn PDF document text
    • https://revunisukigi.weebly.com/uploads/1/3/4/8/134849871/giwamokelemowa-webevafubidama-munat.pdfIn PDF document text
    • http://discovljzg.fun/crucigrama_mi_crecimiento_y_desarrol32255.pdfIn PDF document text
    • http://mexicotop3.xyz/starwood_management_training_programlyext.pdfIn PDF document text
    • http://nakrutkavk.site/rixitopadelizobon1z2s.pdfIn PDF document text
    • http://fiselijuduguge.iblogger.org/26523124217.pdfIn PDF document text
    • http://vanesifonemume.22web.org/basketball_stars_mod_android_1.pdfIn PDF document text
    • http://puzigodemabotod.iblogger.org/likewararukis.pdfIn PDF document text
    • http://podjem2.club/kinobele7hgyw.pdfIn PDF document text
    • http://nature-ital.space/do_you_russell_simmonsq79la.pdfIn PDF document text
    • https://legovizadedugid.weebly.com/uploads/1/3/1/8/131856283/worejatudavoxojaj.pdfIn PDF document text
    • https://xamivozafuju.weebly.com/uploads/1/3/5/3/135308546/tajiginakivobabajaj.pdfIn PDF document text
    • https://dadekubezaxinis.weebly.com/uploads/1/3/2/7/132740399/rifutoma_rikenij_ruzunarud.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dobejevilorizu.epizy.com/china_flag_image.pdfIn PDF document text
    • http://tozoxuzev.epizy.com/ionic_bonding_pogil_goals_answer_key.pdfIn PDF document text
    • http://nawuxek.rf.gd/sufanex.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fe6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE6C 6588 bytes
SHA-256: c6acebe3750ab55c09714fa1b34f6c70ddae3ce202e1a088ffcbc34adab53285
font_01_sfnt_off00010ee6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EE6 5100 bytes
SHA-256: 04368202880f2e659108b7ab804274344556cd299e3528d54ad5548346bd4ae3
font_02_sfnt_off00012046.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12046 2088 bytes
SHA-256: 27a2219357028316c3f9c2b1c1128b163bb5f5ba29d18a233a5faecae2d9e24d
font_03_sfnt_off00012a20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A20 10808 bytes
SHA-256: 20197827944ceae653e1a51cc33ce01815b732381a25eee9cf4e5be70bbd6cbe