Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fae5c97189842c6…

MALICIOUS

PDF

74.9 KB Created: 2021-04-05 23:49:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: a49c70ad66d9c70b7df2832754421015 SHA-1: 963c56cc50ee017c36e2d1658f3d3a4e64eddacf SHA-256: 1fae5c97189842c620a694e7ba91f3e2afa7ff493154d237ad6ef81ee5c588ee
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are SEO-optimized and point to other PDF files, indicating a link farm for SEO manipulation or to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution via the embedded URLs. No scripts were extracted, but the PDF structure and numerous external links are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 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.
  • 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://golowaki.ru/award?keyword=comentario+biblico+adventista+del+septimo+dia+pdf PDF link annotation
    • http://idealslimitaly.site/retrograde_october_2020_sagittarius2jjtx.pdfIn PDF document text
    • http://disukikobofug.22web.org/82754733036.pdfIn PDF document text
    • http://bestplacefor.rest/ice_breaker_questions_for_work0iwwa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450427/normal_5fd8f987b5b9d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408323/normal_6061fc2ea4342.pdfIn PDF document text
    • http://motivawka.online/sojekemubemm8xc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386613/normal_5fcc07c011981.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369503/normal_602407cec95b8.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/gurowozenupifi/21869427711.pdfIn PDF document text
    • https://s3.amazonaws.com/pajukovuxetu/annexure_a1_student_admission_form.pdfIn PDF document text
    • https://c216880a-03a2-4774-ab7e-121c93799e8f.filesusr.com/ugd/b5aed9_aeb1a2bdd1424eca8ed28914c4fd7bc9.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nefunupu/apple_music_free_app.pdfIn PDF document text
    • https://s3.amazonaws.com/jukoxisojow/scarlett_6i6_vs_2i2.pdfIn PDF document text
    • https://65d0a56f-4074-4e8f-9acc-29e6f8e8f663.filesusr.com/ugd/37655d_17c2e00ce0694b5399fb785ae17fe1db.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tuxexi/association_rules_in_data_mining.pdfIn PDF document text
    • https://6c71f620-b6e5-46cc-9e58-526c5f0a7a41.filesusr.com/ugd/1c90dc_3e71d0cfd0b8474fbc618c48fcd5c4f2.pdf?index=trueIn PDF document text
    • http://nufurezoguboli.epizy.com/nitrogen_fixation_by_rhizobium.pdfIn PDF document text
    • http://janepalefudu.epizy.com/bearded_dragon_care_sheet_pet_supplies_plus.pdfIn PDF document text
    • http://fukasutatota.rf.gd/19144453258.pdfIn PDF document text
    • https://2ae8fa2d-8b21-4cd7-bd94-b44763fb9b4d.filesusr.com/ugd/8e1ec7_446ef94f299e4d24bc1767b6764a6f62.pdf?index=trueIn PDF document text
    • http://kokiralasido.epizy.com/carbapenemicos_2017.pdfIn PDF document text
    • http://sapovupiz.rf.gd/kapapofewamu.pdfIn PDF document text
    • http://mupopeseri.rf.gd/pukilevun.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_off0000d78f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD78F 5312 bytes
SHA-256: 57eaa7294206336c305e7d1537fac6a6fb5abf3e118a3cc81c485b0a6de74b7a
font_01_sfnt_off0000e97b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE97B 11888 bytes
SHA-256: c300f7d24f5d4e1ae778bd120bccfd1827497c87a28f763deb43a3191271749e
font_02_sfnt_off00010fed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FED 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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