Malicious PDF — malware analysis report

Static analysis result for SHA-256 10ff141fa7830691…

MALICIOUS

PDF

75.5 KB Created: 2021-03-18 19:30:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 5039d6d8cbaaf4b0f63027d485da4688 SHA-1: e1fe5bce85e908206245442659fbc859be46de5c SHA-256: 10ff141fa7830691b7c951a1aa8fe24c5ff65d5a1f5aedfecf8c77570e26e1e8
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 0.9989

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://jumiwimov.ru/strik?utm_term=when+you+share+a+post+on+facebook+who+sees+it PDF link annotation
    • http://presentinsta.online/teenage_romance_movies_on_netflix_2016zh4ck.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426422/normal_5fe7e273005ff.pdfIn PDF document text
    • http://cetapp.xyz/buveramufazagavexiw1nh5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384323/normal_6035da64710f6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369311/normal_5fcb2e10897a6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379959/normal_5fe86279620a8.pdfIn PDF document text
    • http://tryraisins.club/how_to_unclog_an_ativa_shreddery19xq.pdfIn PDF document text
    • http://sethel.xyz/17332628542epg5p.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366653/normal_603e8550a2f9e.pdfIn PDF document text
    • http://banki-internetowe.com/stanley_45_plane_parts_diagramd0t4x.pdfIn PDF document text
    • http://solapp.xyz/32196905591ryilt.pdfIn PDF document text
    • http://sport-stavki.fun/fichas_de_trabajo_en_word1yflx.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/04d9426b-0ea2-4d55-929d-b06dbdd32dc5/10432133333.pdfIn PDF document text
    • https://ac3db616-04cb-40f1-8357-c67041f5e20c.filesusr.com/ugd/eda9ba_0e6a8a0603a74ee0a287c239382b47ce.pdf?index=trueIn PDF document text
    • https://d52aed46-be45-4f9b-8106-cf6fc7ee66c0.filesusr.com/ugd/b148e5_063e9810ba3f4e52bc415ee7e49512e3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zumomasugipeno/epc_full_form_b._ed_course.pdfIn PDF document text
    • https://s3.amazonaws.com/wixanarer/bestwap_raazi_full_movie.pdfIn PDF document text
    • https://30c0d994-bee2-4d79-bc91-d4aaa7251653.filesusr.com/ugd/0962d9_617f1026d7c94ed3a8aeb850cdc60c5f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c7ace47-db4c-462a-8d5e-6b514dba422b/38761813023.pdfIn PDF document text
    • https://a3c35cc3-4a3f-4d41-ab51-8b3e4b114d30.filesusr.com/ugd/2b25b5_d314927fad13422388dc4f7b7510aa6c.pdf?index=trueIn PDF document text
    • https://7a9095e9-4ba3-4ff7-9406-a75d0382ce8a.filesusr.com/ugd/db93e9_6c1d0cb8860344ef985b855ce838e3a5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a82a7ed-b192-4e40-804c-d61a86eb4a17/explain_freud_theory_of_personality_development.pdfIn PDF document text
    • https://s3.amazonaws.com/zifozujiwi/what_does_cbt_do_for_anxiety.pdfIn PDF document text
    • https://s3.amazonaws.com/gogoxowiniza/6684660462.pdfIn PDF document text
    • https://s3.amazonaws.com/zesixefe/wahl_cordless_clipper_set_uk.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d98d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD98D 5364 bytes
SHA-256: d29e4ebd947cbd2135822ba028b910406bc06663cc5e2eef9f6ffb3b9b4d445a
font_01_sfnt_off0000ebd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBD9 10520 bytes
SHA-256: b375fb40d9f651a41fa3e89c5923b0b1c210fd38932af35e81d552539305183c
font_02_sfnt_off00010fcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FCD 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c