Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9e730b27ce4e59f…

MALICIOUS

PDF

84.8 KB Created: 2021-04-27 21:46:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: aea55e69dbab5f4b08a81fa8849303f0 SHA-1: 503ee190e1a53e42c5d7800c62c198e967582a85 SHA-256: d9e730b27ce4e59f12838005d04505d6ca88511874fb4b12932361e985b96adc
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by 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 0.9995

Heuristics 5

  • 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://xajibur.ru/strik?utm_term=sony+hdr-cx160+manual+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4416935/normal_5fcf8339ad3d4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483103/normal_60402f115b4c6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493916/normal_605378cf5feb1.pdfIn PDF document text
    • http://nizumewuminal.iblogger.org/napepisadofu.pdfIn PDF document text
    • http://bivisurat.22web.org/49519650189.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381302/normal_604d35879657e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426090/normal_6052fae8868ec.pdfIn PDF document text
    • http://xudaxusikuzusu.22web.org/bauhaus_school_of_architecture.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://59548cc9-d6a6-4b2e-bd73-2bfb7290c7b5.filesusr.com/ugd/3fd21f_3b496555707d4735a6e64e1c6a5d087f.pdf?index=trueIn PDF document text
    • https://4dcfe184-cd6c-48f8-9f23-5461c743a1d4.filesusr.com/ugd/cc8533_41aef529d5ba4c819dca04bd11356695.pdf?index=trueIn PDF document text
    • http://mujupav.epizy.com/98243538447.pdfIn PDF document text
    • https://9eff4bf0-55a5-42b9-a65a-250f23c32afd.filesusr.com/ugd/80978b_b6c90b8267594e9d94f470ac2458171c.pdf?index=trueIn PDF document text
    • https://27a83426-c768-4525-a63d-b5b732cca755.filesusr.com/ugd/28b3f7_8cdfddb779ec457687ea43390405f479.pdf?index=trueIn PDF document text
    • http://vezoxonu.epizy.com/brooks_brothers_polo_fit_guide.pdfIn PDF document text
    • https://065b66ee-25d8-4381-b309-094abc4d823c.filesusr.com/ugd/2703e6_3f34895d6279413eacc3efcb669009a8.pdf?index=trueIn PDF document text
    • https://13cfbe10-32e4-4d7a-9072-8dbd3280e6b8.filesusr.com/ugd/994e9e_cf015f6e09364928a266f4cd88ea5940.pdf?index=trueIn PDF document text
    • https://91ca87c2-c493-4616-adaa-fbcec45394e1.filesusr.com/ugd/6116da_a5bea4fdae79463e842c22c46f9eba06.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dobesogum/define_accole_forms.pdfIn PDF document text
    • https://s3.amazonaws.com/novipaliwid/kenmore_70_series_dryer_parts_list.pdfIn PDF document text
    • http://wuredavamawot.rf.gd/high_volume_calisthenics_workouts_program_format.pdfIn PDF document text
    • http://tevisub.rf.gd/jasoranizu.pdfIn PDF document text
    • https://s3.amazonaws.com/nuruvapozixix/fernando_pessoa_poemas.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_off0000fabd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFABD 5504 bytes
SHA-256: 399aad2fe223970d5f4921de328a334cd90d11c78594e3505137cf4567b67681
font_01_sfnt_off00010d48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D48 14656 bytes
SHA-256: 5695426b02ef9e7e16d1672ed07edbde7936cecfbd7265f08c7d385c2f2270f2
font_02_sfnt_off000137cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137CD 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e