Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c045dd95732519b…

MALICIOUS

PDF

75.1 KB Created: 2021-04-01 01:07:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: c0350493ad6518796e9b5ee992d056e8 SHA-1: 548551386eaa04d1a4e6ad3e57417604cc512c18 SHA-256: 4c045dd95732519b2950a5d661cbf1a9df873f46ed1bcb7857d0c73d7483926c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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
  • 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://druttle.ru/award?keyword=otto+ecocardiografia+pdf PDF link annotation
    • https://wisiwojapano.weebly.com/uploads/1/3/4/8/134896472/lilojonug_taliko_virewabawa_zuduvarinub.pdfIn PDF document text
    • http://medgaj.com/grenada_lake_ms_crappie_fishing_guides6f5g2.pdfIn PDF document text
    • http://national-verifyteam.com/zavadudojakufaneri7gwhg.pdfIn PDF document text
    • http://kevogam.22web.org/84459270311.pdfIn PDF document text
    • https://jowatoziji.weebly.com/uploads/1/3/4/8/134893097/3819092.pdfIn PDF document text
    • http://rexasokozeg.iblogger.org/searching_and_sorting_algorithms_in_c.pdfIn PDF document text
    • https://wodanosivowifig.weebly.com/uploads/1/3/4/5/134593279/vazatifarorekeb.pdfIn PDF document text
    • https://pozimifekof.weebly.com/uploads/1/3/4/6/134674510/842881.pdfIn PDF document text
    • http://wugafis.66ghz.com/motororepakebu.pdfIn PDF document text
    • http://onsideball.info/vowulepos5vo9q.pdfIn PDF document text
    • http://counterman.ru/how_to_sew_a_3d_face_mask_free_sewing_patternmgysn.pdfIn PDF document text
    • https://jeluxipofike.weebly.com/uploads/1/3/4/4/134490416/nalirunufizafaxiwul.pdfIn PDF document text
    • https://mavuzoxawajike.weebly.com/uploads/1/3/0/9/130969593/goxofozopafovowow.pdfIn PDF document text
    • https://xejibojap.weebly.com/uploads/1/3/4/3/134310503/3555101.pdfIn PDF document text
    • http://casserlabs.xyz/620859531909ynuy.pdfIn PDF document text
    • https://wutodifutatur.weebly.com/uploads/1/3/2/8/132814097/pawexefum.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gasadilipebafup.rf.gd/wovumemirudozovale.pdfIn PDF document text
    • http://madukavinoxonal.epizy.com/denticon_user_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/xasovewipeje/61122565430.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/206598c6-d02c-4616-938c-19406ff5b714/what_is_energy_healing.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f8e7e639-d4c2-4ddd-8f84-157a60d42c96/linigonupad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa92ee92-ac66-46f2-88c4-e08d7319d78f/what_is_dbt_distress_tolerance.pdfIn PDF document text
    • https://s3.amazonaws.com/wozoxub/sea_doo_islandia_service_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/95c3e991-46ad-4e2d-86dc-3c5f13305c6b/how_to_become_a_certified_drivers_ed_instructor.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e7a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7A4 5140 bytes
SHA-256: fb626bcc28fc1d1f5933cb953b15103483cf11da88fee13588ea07dfd08b5eec
font_01_sfnt_off0000f932.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF932 11092 bytes
SHA-256: c8e5cb9fad5c551de46e01e51c0ae95f41c7ef67229bb3eced1d5e4e819656f4