Malicious PDF — malware analysis report

Static analysis result for SHA-256 b99a94a538c83d5e…

MALICIOUS

PDF

79.9 KB Created: 2021-03-19 17:50:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 32d697f4801a62410a43e533a785bd68 SHA-1: 882d23881994562d5aebcd747edfa5b7bfe8f7c6 SHA-256: b99a94a538c83d5eba95e41fb4ca81ddc31856b671381973abdaf2294c4c295b
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting, and is flagged by ML classifiers and ClamAV as malicious. The document body, though heavily obfuscated, contains strings that appear to be related to search engine optimization and link farming, suggesting an attempt to disguise malicious links as legitimate content. The presence of external URIs and the overall structure indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://mezovuduw.ru/wix?keyword=college+chemistry+1+notes PDF link annotation
    • https://lobovalosidim.weebly.com/uploads/1/3/1/4/131437181/xawomijomonana_vujagufujo_gexeral.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381964/normal_5fd61008c8b18.pdfIn PDF document text
    • http://btsworld.org/sanowesokuzejonabawufunokdrbzl.pdfIn PDF document text
    • https://nolaxefipox.weebly.com/uploads/1/3/4/7/134740184/8051105.pdfIn PDF document text
    • https://sulesebu.weebly.com/uploads/1/3/4/6/134634805/66c8ed4ef30d40d.pdfIn PDF document text
    • https://cdn.sqhk.co/dejijadu/phg0bia/descargar_musica_de_los_80_gratis_en_ingles.pdfIn PDF document text
    • http://d-youtube.com/861143916376rafl.pdfIn PDF document text
    • https://cdn.sqhk.co/jepipovi/VO8jbZs/82049088947.pdfIn PDF document text
    • https://dulubomin.weebly.com/uploads/1/3/4/6/134602246/9624453.pdfIn PDF document text
    • https://cdn.sqhk.co/gazamara/xekibjc/hit_knock_destroy_tower_defence.pdfIn PDF document text
    • https://pawomasa.weebly.com/uploads/1/3/4/7/134737305/6175178.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420224/normal_60118f590042b.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://s3.amazonaws.com/tixedujegibex/70333950231.pdfIn PDF document text
    • https://s3.amazonaws.com/jesidofefe/the_psychoanalytic_theory_of_gender_stems_from.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f0a1aa3-847e-4729-866b-c5f8ebf58a5a/how_to_fix_kenmore_ice_maker_not_making_ice.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0777f917-5f85-43ea-a496-a445ce1742af/91594324062.pdfIn PDF document text
    • https://s3.amazonaws.com/gofilafixu/27846150718.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c736ec5-b0e5-48a0-9208-43108ecbefa8/linear_integrated_circuits_u_a_bakshi.pdfIn PDF document text
    • https://s3.amazonaws.com/tinajabizoreguf/94_answers_level_3_a_dangerous_job.pdfIn PDF document text
    • https://s3.amazonaws.com/babetafaperaxov/vowulazokiz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e847c1a-6911-4035-9d6e-c181fb7afd62/wurorigifufefoturefof.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f36285c4-1450-43cc-a50f-a78f7a252dbd/romantic_poem_for_wife_on_her_birthday_in_hindi.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_off0000ec05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC05 4968 bytes
SHA-256: 0c2245c9bed92d0f05334e42c367f257eacc023e847f34fe8dc70479a10e7175
font_01_sfnt_off0000fcd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCD5 11452 bytes
SHA-256: aad92b2059a055578985fed3a50a9c8187002310a7e460cdaa55b1869efb966b
font_02_sfnt_off000123c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123C7 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176