Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf400744a0ed8af1…

MALICIOUS

PDF

87.6 KB Created: 2021-04-07 23:08:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 016536c8e944a85455b870ec7805abdc SHA-1: ac950f2a556123b551dd57714738873e0031f4ac SHA-256: bf400744a0ed8af14b7fa3072261fc3b3f9f04c2338bd2aac448b2e953ed63bc
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 0.9997

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://xajibur.ru/wix?keyword=overlord+light+novel+volume+1+pdf PDF link annotation
    • http://fuxanujibiz.mygamesonline.org/african_mask_template.pdfIn PDF document text
    • http://xeberul.mywebcommunity.org/avon_brochure_september_2020_download.pdfIn PDF document text
    • https://xotizirew.weebly.com/uploads/1/3/1/8/131855992/4632560.pdfIn PDF document text
    • http://copyrighthelpcentral.com/25183486085i07aj.pdfIn PDF document text
    • http://prod-fruit.space/mass_gaining_diet_plan_for_skinny_guysqgvwy.pdfIn PDF document text
    • https://pexasuwen.weebly.com/uploads/1/3/4/5/134593650/ac5de659f3ce0b.pdfIn PDF document text
    • http://dajexori.mypressonline.com/powobafozuvanegapexogidap.pdfIn PDF document text
    • http://lunatan.medianewsonline.com/97256886729.pdfIn PDF document text
    • http://powajaxib.medianewsonline.com/al_quran_file_free_download.pdfIn PDF document text
    • https://widegavadiwudux.weebly.com/uploads/1/3/5/3/135325068/5440906.pdfIn PDF document text
    • https://wiromokuxuzub.weebly.com/uploads/1/3/5/2/135298753/gulexufigefip_bumokebu_wapamitunud_lexip.pdfIn PDF document text
    • https://kavixonew.weebly.com/uploads/1/3/4/5/134592395/simevajujufelif.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jebokizez/weaknesses_of_teaching_methods.pdfIn PDF document text
    • http://pusebirenox.myartsonline.com/the_all-american_slurp_questions_and_answers_class_7.pdfIn PDF document text
    • http://zotubune.myartsonline.com/how_do_i_connect_my_turtle_beach_elite_800_to_my_pc.pdfIn PDF document text
    • https://s3.amazonaws.com/tometubufimopim/guzorezo.pdfIn PDF document text
    • https://s3.amazonaws.com/mejifavo/49324527198.pdfIn PDF document text
    • https://s3.amazonaws.com/pegebunov/63872145606.pdfIn PDF document text
    • https://s3.amazonaws.com/rubidokezive/risk_assessment_format_example.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010272.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10272 5208 bytes
SHA-256: 2901490eb9a386eaa09d3d4f37f37ee0132e18ef294c0523911b0d294c02ace4
font_01_sfnt_off0001140b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1140B 11208 bytes
SHA-256: a60744d4333f725f09efeaa1d81b45f9bd4e94dbdb2cd8e974469fc791832f55
font_02_sfnt_off00013a3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A3C 16220 bytes
SHA-256: ced60642bba79bd88af53e6a78ad210669dd42df708d268f630a19cf74053489

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