Malicious PDF — malware analysis report

Static analysis result for SHA-256 c18759871fefbee3…

MALICIOUS

PDF

78.4 KB Created: 2021-06-01 02:28:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 207d21952b35747466882ce25a771254 SHA-1: 13383aef489e0f7d4c0383bc1f8a779b321ee200 SHA-256: c18759871fefbee3a2d564462efcac48cacdceb773ce5451022df156c813274e
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to a link farm hosted on disposable domains, a common tactic for phishing or distributing further malware. ClamAV and ML classifiers strongly indicate malicious content, specifically identified as Pdf.Phishing.Trojan. The presence of external URIs and the link farm structure suggest an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nomylo.ru/pbw?utm_term=ocotillo+wells+ohv+news PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4445737/normal_5ff2cc388f1fb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393776/normal_604a5ba6abf6d.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4412774/normal_60b55ce3c39a2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370275/normal_600f455af2f68.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446944/normal_603e4346e91ba.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4381094/normal_60b2bb722fdbf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371244/normal_60524f3a62c41.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368251/normal_60635d5d129db.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d77098c-23fe-45a7-91e5-9534f0562676/vukivev.pdfIn PDF document text
    • http://tazijebep.pbworks.com/w/file/fetch/144429024/garrys_mod_fnaf_1_map_download.pdfIn PDF document text
    • http://fuvesiwowegu.pbworks.com/f/dopumef.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d16396da-645b-4c74-a186-5b2d1e1c21c5/pit_bike_ou_dirt_bike_difference.pdfIn PDF document text
    • http://didaneguk.pbworks.com/f/fast_food_business_plan_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/05a50232-699f-4263-863b-8c69772973e9/signs_of_life_in_the_usa_9th_edition.pdfIn PDF document text
    • http://gazumadu.pbworks.com/w/file/fetch/144431382/vusamujurozomo.pdfIn PDF document text
    • http://xalomuzavege.pbworks.com/w/file/fetch/144432588/15030958918.pdfIn PDF document text
    • http://xujefix.pbworks.com/w/file/fetch/144428871/hp_beep_code_3_long_3_short.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1400e87e-1eee-416a-ab08-53cda27c5008/26858377403.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/433e3cb0-09a1-4ca0-932d-cfb36c7ffee0/48_laws_of_pimping_quotes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ab40a6c-36a0-4be1-83b2-20416a2d0d07/what_is_the_theme_of_the_story_charles.pdfIn PDF document text
    • http://wekibivu.pbworks.com/w/file/fetch/144432663/manual_record_keeping_for_small_business.pdfIn PDF document text
    • http://nilanom.pbworks.com/f/how_to_cancel_brinks_security.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/46d6c07e-2fff-4ca7-a87e-273564bf2a71/kojanotad.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_off0000f6b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B0 4760 bytes
SHA-256: f9e42060098d0a58a0c3fddeb9571c5cb645cc832aa9b0d636e23f6379495940
font_01_sfnt_off000106ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106FF 11284 bytes
SHA-256: e5e35ecd402d49c3e06eb0738e780e9b5663c8d4020e29282277d1aafa26a9d9

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