Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bfebfc55dd8535b…

MALICIOUS

PDF

78.3 KB Created: 2021-05-22 04:00:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: f24561dfc47c186da81f479166baf48d SHA-1: 466f11eeb62e5953f88127924e113dbad49c14eb SHA-256: 1bfebfc55dd8535b89f13394bfa5cfbb70aecd0c596c653da620bd1393ff25a6
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external links, with a significant number pointing to PDF files hosted on Weebly and other platforms, suggesting a link farm or redirection mechanism. The primary external URI, 'https://jacksth.ru/strik?utm_term=the+human+body+pressure+points+diagram', indicates a lure to a potentially malicious website. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://jacksth.ru/strik?utm_term=the+human+body+pressure+points+diagram PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4464523/normal_606dcbe1519b5.pdfIn PDF document text
    • https://duvefotod.weebly.com/uploads/1/3/1/3/131380754/3822877.pdfIn PDF document text
    • https://repitosa.weebly.com/uploads/1/3/2/6/132681506/b52ba487.pdfIn PDF document text
    • https://kirugalepolofaw.weebly.com/uploads/1/3/4/3/134340862/juwirudi_pakifesotodada_butawawuboponej_nimeje.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451019/normal_605f4c4ea8984.pdfIn PDF document text
    • https://xebololu.weebly.com/uploads/1/3/4/3/134340913/2796092.pdfIn PDF document text
    • https://mezovojexojija.weebly.com/uploads/1/3/0/8/130874002/9430158.pdfIn PDF document text
    • https://didejigoximatex.weebly.com/uploads/1/3/1/0/131070501/2999d85446c.pdfIn PDF document text
    • https://dexajuvado.weebly.com/uploads/1/3/4/4/134470202/821dd3d8f494.pdfIn PDF document text
    • https://famixarusefon.weebly.com/uploads/1/3/4/3/134396739/jiran.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4503279/normal_600c057903a38.pdfIn PDF document text
    • https://jegobegopij.weebly.com/uploads/1/3/1/8/131871729/1284443.pdfIn PDF document text
    • https://kiluzamomumu.weebly.com/uploads/1/3/5/3/135344913/befilolofolol.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/c0f087f2-2f94-42df-84ad-aaebcb83de71/what_is_the_meaning_of_color_constancy.pdfIn PDF document text
    • https://s3.amazonaws.com/rejiner/report_lost_emirates_id_card.pdfIn PDF document text
    • https://s3.amazonaws.com/tawosutosuxi/how_often_to_service_toyota_prius.pdfIn PDF document text
    • https://s3.amazonaws.com/liluvad/53125440807.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/237c2554-5078-4ad2-9c18-c363e6436d29/lasanozozulojajafoxif.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/30e1ab16-841b-47f6-abf2-1b70aec08792/fundamentals_of_english_grammar_5th_edition_download.pdfIn PDF document text
    • https://s3.amazonaws.com/gulapore/72078040314.pdfIn PDF document text
    • https://s3.amazonaws.com/tojabixefova/tadusovoratanezanisefus.pdfIn PDF document text
    • https://s3.amazonaws.com/savukojubusum/voperaki.pdfIn PDF document text
    • https://s3.amazonaws.com/tokudapele/77831517549.pdfIn PDF document text
    • https://s3.amazonaws.com/zunaporam/procreate_quick_tips.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f55e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF55E 5532 bytes
SHA-256: aad551e2ec47f7c3ff8df0bd0f7b532dadd3ef4a425ea8a8923a7ef023356b16
font_01_sfnt_off000107fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107FE 10504 bytes
SHA-256: 9317f986c0586ce33a5e838f6686b4fa3c9734f27ce4bd2bac2e9faf675386c2

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