Malicious PDF — malware analysis report

Static analysis result for SHA-256 259592e79b768dbc…

MALICIOUS

PDF

87.7 KB Created: 2021-05-09 14:20:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 4551eae9c43572fdb8c099c37e6f3f2c SHA-1: 104032f4346372bc9efedb639052388d3836c2ea SHA-256: 259592e79b768dbc3957c4ee07b40ccf6737d7fe9cfe4e486f1733b6cb4e1688
66 Risk Score

Malware Insights

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

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 0.9991

Heuristics 4

  • 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://resalured.ru/strik?utm_term=concepto+de+inteligencia+emocional+segun+daniel+goleman PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4446162/normal_5fd65f29723b7.pdfIn PDF document text
    • http://4kuhd.me/231436654335u279.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496005/normal_6002f2c14534f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408702/normal_6063ed5155ca9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467286/normal_5fc98871e1983.pdfIn PDF document text
    • http://lnstagram-help-businesss.com/75770192844dhtxj.pdfIn PDF document text
    • http://future-techno.ru/nefekimedibigibek64r1.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://uploads.strikinglycdn.com/files/e6096a19-a092-432a-a68a-70e4e1226158/ice_fishing_rigs_for_lake_trout.pdfIn PDF document text
    • https://dfa52777-3edb-460f-9b14-ca5101cd4ecc.filesusr.com/ugd/5360f8_c5857d2d2d2e45e3ac97933e2dd2f5d2.pdf?index=trueIn PDF document text
    • https://9c33b4df-6f14-41ad-9e94-a3a23f7ed20d.filesusr.com/ugd/2a975f_eef6fe47d18144efbce189e0d2861194.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mulerux/antenna_tv_guide_richmond_va.pdfIn PDF document text
    • https://feedbc21-cb93-402c-9ae2-3476589645d2.filesusr.com/ugd/f3ecbe_bde601718ccc4d24a56c7675d91129ce.pdf?index=trueIn PDF document text
    • https://e824aeac-d22a-4b45-bb3c-17051d6ee04f.filesusr.com/ugd/de60da_499681002e5e4afa94a3aaa19f59dd83.pdf?index=trueIn PDF document text
    • https://121f8fc1-d270-4171-a721-8ccd656fc20f.filesusr.com/ugd/2ca22b_5339b1a039c540a1a8d60c3206b099e7.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rodiligarexo/bloomberg_commodity_index_factsheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d693302-a2df-477b-a39b-41eb023b7c43/21011936913.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a3da3b9-372b-44f2-b8aa-88962e667d18/liwebijasedu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b2388faf-7803-4441-897d-78c0acc88c35/99730684691.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/93e3d4f8-855c-4e26-84f9-8f796297472f/laxewanigozoleretomapuvut.pdfIn PDF document text
    • https://s3.amazonaws.com/jezekemunidup/admango_ad_spend_report_2017.pdfIn PDF document text
    • https://s3.amazonaws.com/gitipelut/moviesda_malayalam_movie_2019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bec286ca-f024-4299-9af5-8d400d02e60b/weight_training_exercises_at_home_with_dumbbells.pdfIn PDF document text
    • https://s3.amazonaws.com/tinezedu/male_hygiene_guide.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_off000106c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106C0 5200 bytes
SHA-256: c1a3059df96add9664712c026d190cae49e559d14c2be600901eb77878860576
font_01_sfnt_off0001185a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1185A 13408 bytes
SHA-256: c44004aa51c928c3b5e448fa2bf4d0d69445f39522d3c9fb17bd84f58ff89d53
font_02_sfnt_off000140f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140F2 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378