Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e04b12c3cfebd43…

MALICIOUS

PDF

79.7 KB Created: 2021-04-06 20:26:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: b9d27d81d8ebec1d7e4237c654857049 SHA-1: 270261e5a4b44d94c47aadeab8b48e33596b9b5f SHA-256: 2e04b12c3cfebd43f7d4ead546695f48fcc5c1a409a66b97118ee599a7cb19bd
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as a link farm, containing numerous external links to potentially malicious websites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded URLs suggest an attempt to redirect users to compromised or malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jacksth.ru/strik?utm_term=dsc+user+code+attributes PDF link annotation
    • http://iciapp.xyz/how_do_you_get_hilton_rewardshxdu9.pdfIn PDF document text
    • https://werunumugupis.weebly.com/uploads/1/3/4/3/134399568/37891.pdfIn PDF document text
    • http://ehaberdevlet.com/79112293127eyo88.pdfIn PDF document text
    • https://dijodiruji.weebly.com/uploads/1/3/4/0/134097483/xiwolagoxalugikanile.pdfIn PDF document text
    • https://biwawabagukolaz.weebly.com/uploads/1/3/4/7/134730268/bimoxop-wumujijef-loguzazowu-xudubem.pdfIn PDF document text
    • https://fosogizubosa.weebly.com/uploads/1/3/1/6/131637108/firugozonukizedim.pdfIn PDF document text
    • http://speak4pro.com/answer_key_of_dsssb_ldc_exam_2015gk7x1.pdfIn PDF document text
    • http://zoneeuro.pro/51981991234d9c87.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://6d0c6d30-55b9-4b7f-8145-34d11b484ddf.filesusr.com/ugd/8db56d_37517d22085346cfba896d8e0ce502ac.pdf?index=trueIn PDF document text
    • https://684917c6-b594-4497-9ea4-141105166a5b.filesusr.com/ugd/0dc9f5_26487313b9f244238229c01354c9eca4.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tuzakifezara/senedarudivatisokopafu.pdfIn PDF document text
    • https://s3.amazonaws.com/fekaduvopigab/topamavevivovurebuwuros.pdfIn PDF document text
    • https://4cf6c2b4-cd84-4b73-83b1-bf7f441162b2.filesusr.com/ugd/e50c99_cba9098ccef94a8f824953ccaded48c3.pdf?index=trueIn PDF document text
    • https://c4cd0dbc-23d7-4f11-b65f-2561cec8abe5.filesusr.com/ugd/516793_76051d6f330947aebd045f5ec8441e07.pdf?index=trueIn PDF document text
    • https://2a04f01a-7147-4793-98aa-b59dc93e6f96.filesusr.com/ugd/efcdeb_92f53dbe64e54e669e0edeabdb9a0c0d.pdf?index=trueIn PDF document text
    • https://d8ec88ce-93b1-4b83-b294-7016fd5b5063.filesusr.com/ugd/366252_c4499db76cfe483fab06b7ead56ccf30.pdf?index=trueIn PDF document text
    • https://f459ab6e-ac57-43ce-b83a-1524846427e4.filesusr.com/ugd/938c70_fbf4d96f6e57453fb5ca31da9e113aa8.pdf?index=trueIn PDF document text
    • https://dbb1fad9-9c05-458f-9e32-bc0b7f65d7ec.filesusr.com/ugd/451461_8f1aef2c8f6c4781878fdeab728fd62a.pdf?index=trueIn PDF document text
    • https://a49aa754-465e-4bbd-924e-b3d0e7b66bd4.filesusr.com/ugd/81d6a4_c33910ade1044752be3043bc26aa462b.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_off0000f841.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF841 5040 bytes
SHA-256: 579003b2931e2627d27cb36340ecd840eccb207b6568a7edbf69b19fd75f9793
font_01_sfnt_off00010970.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10970 11328 bytes
SHA-256: 04858bac8f47ee46534b82e9c33980c07c979889542fdc7565171c7d1500bff1