Malicious PDF — malware analysis report

Static analysis result for SHA-256 53c87ef53095e193…

MALICIOUS

PDF

90.3 KB Created: 2021-05-09 06:01:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 7b47f546fc0c857d329016f931636d84 SHA-1: 7388708bd3dde0c691ecde3c4ee43203a7495d99 SHA-256: 53c87ef53095e193d09a9d3812000837d6d4caa201b6425e26e696c3ddd67d94
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, with one primary URL pointing to a suspicious domain. The ML classifier and ClamAV detection strongly indicate maliciousness. The document body, though heavily obfuscated, suggests a lure related to 'inheritance law' to direct users to these external resources, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://maypoin.ru/strik?utm_term=define+law+of+inheritance PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4380694/normal_6064d413d3522.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446380/normal_605f88771fa6b.pdfIn PDF document text
    • https://cdn.sqhk.co/lofakekaf/jfhgOha/twitter_hashtag_promotion.pdfIn PDF document text
    • https://cdn.sqhk.co/jopubelo/dpgejdh/promised_lands_bellingen_directions.pdfIn PDF document text
    • https://cdn.sqhk.co/pisapaxosabo/egjowgh/37383253340.pdfIn PDF document text
    • https://cdn.sqhk.co/tinolaseja/wibibie/45656994846.pdfIn PDF document text
    • https://cdn.sqhk.co/fegukajebaj/hciphie/experimental_extinction_meaning_in_psychology.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494648/normal_604a30468cd5c.pdfIn PDF document text
    • https://cdn.sqhk.co/jotapepikota/igbdjgh/crowded_house_sauvignon_blanc_2014.pdfIn PDF document text
    • https://cdn.sqhk.co/fugovigul/gjhgigh/vodulututupedevulizif.pdfIn PDF document text
    • https://cdn.sqhk.co/pufojoloz/haHzggd/54723890268.pdfIn PDF document text
    • https://cdn.sqhk.co/xufaribo/hfzDhcP/samsung_notes_app_font_size.pdfIn PDF document text
    • https://cdn.sqhk.co/tefozakozup/ejhjgfA/big_city_life_simulator_apk_mod_revdl.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/9c4a4c27-1678-4ae9-ab71-d17399d9e6a7/6970171016.pdfIn PDF document text
    • https://s3.amazonaws.com/luborinizu/76928814611.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4232b19-2391-4cd2-9cda-9d000eb710b1/ms_project_training_course_online.pdfIn PDF document text
    • https://s3.amazonaws.com/jazamerijekufol/87718670386.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7bfbee40-04a9-4de4-96ae-99abbccd6c2b/dirajadikog.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c6a9107-8bdf-49c5-b216-1141dfdbf137/blue_nile_diamond_retailing_case_study_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4095035-55a7-4813-bee0-0028cf78ea1c/when_do_navy_advancement_results_come_out_2021.pdfIn PDF document text
    • https://c18d7360-3707-4bf1-9d6f-52ba7510fa17.filesusr.com/ugd/76cb06_e8a7679d2118400cb9f5b2b5b5f8e020.pdf?index=trueIn PDF document text
    • https://46b09160-81f9-4cb3-9cca-f7b5b0c0229e.filesusr.com/ugd/179cc6_a3a74aa1221e4c6589a53e91897c893f.pdf?index=trueIn PDF document text
    • https://e2604e0b-f95a-4acb-b53f-a7db3827b2a1.filesusr.com/ugd/225520_4cefec818061491997f2d6db6686e5dd.pdf?index=trueIn PDF document text
    • https://1c019786-7048-4615-837a-ae53f087c4ae.filesusr.com/ugd/8b4172_c1819dcad7224997afd18d0dcf19d363.pdf?index=trueIn 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_off0001238d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1238D 4880 bytes
SHA-256: 85facc18653c8ee0575f3874c1b4bc399d21ab6da9f1414b2ad07d4e58cfc48a
font_01_sfnt_off0001343e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1343E 11132 bytes
SHA-256: 35f56be6fb349586c02011be3977406d6ab8ba6600db0b283985efaf45153468