Malicious PDF — malware analysis report

Static analysis result for SHA-256 421e1eb6f4ac13f3…

MALICIOUS

PDF

83.1 KB Created: 2021-03-24 07:42:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 2dc106f8d7197ad91d81650cfc389e31 SHA-1: 20558b80b52a5c51c3e1359d94db85af42fe4665 SHA-256: 421e1eb6f4ac13f321e72429a8b329af9070108d65cea3efea51412fd907ed67
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable domains or link farms, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, contains text related to search queries, reinforcing the lure to a malicious website.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 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://baarspo.ru/wix?keyword=cell+membrane+transport+mechanisms+lab+answers PDF link annotation
    • https://gitikaru.weebly.com/uploads/1/3/4/9/134901111/vuragizered-fanopeted-vapitadu.pdfIn PDF document text
    • http://nosetibadap.iblogger.org/penefubebuludeja.pdfIn PDF document text
    • https://matamelo.weebly.com/uploads/1/3/1/3/131384575/sakebofarimogan.pdfIn PDF document text
    • https://zekulereloto.weebly.com/uploads/1/3/2/7/132710655/3417983.pdfIn PDF document text
    • http://zikapipumimapo.22web.org/management_job_description_template.pdfIn PDF document text
    • http://raponikidosal.getenjoyment.net/how_to_connect_turtle_beach_stealth_600_gen_2_to_xbox_one.pdfIn PDF document text
    • http://sokobumoxagug.scienceontheweb.net/tumikuku.pdfIn PDF document text
    • https://fovevirikat.weebly.com/uploads/1/3/0/7/130775443/zadako.pdfIn PDF document text
    • http://mudikovarew.mygamesonline.org/91000894479.pdfIn PDF document text
    • http://rarojujelalonu.iblogger.org/all_the_lovely_bad_ones_free.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://koburolamugalo.rf.gd/pc1616_add_user.pdfIn PDF document text
    • http://liwobeve.rf.gd/13015133186.pdfIn PDF document text
    • https://s3.amazonaws.com/xazarujokemus/27018783437.pdfIn PDF document text
    • https://s3.amazonaws.com/fowikorejodi/barkergilmore_in-_house_counsel_compensation_report.pdfIn PDF document text
    • https://s3.amazonaws.com/wovigebi/33564273507.pdfIn PDF document text
    • http://zipemoluligera.myartsonline.com/cessna_421c_poh.pdfIn PDF document text
    • http://zabukek.rf.gd/ferikimorizexunoxanomiwak.pdfIn PDF document text
    • http://puwoxigawezab.epizy.com/tipos_de_funciones_inyectiva_sobreyectiva_biyectiva_ejemplos.pdfIn PDF document text
    • http://futiwani.rf.gd/long_john_silvers_nutrition_facts.pdfIn PDF document text
    • http://gisonebabi.epizy.com/merufanin.pdfIn PDF document text
    • http://tovanafinavo.rf.gd/70373604254.pdfIn PDF document text
    • http://tosalovubel.epizy.com/fogexurubejakikakokuxapuf.pdfIn PDF document text
    • http://nofolimuri.myartsonline.com/short_story_download.pdfIn PDF document text
    • http://fukijudetoj.epizy.com/jugavivibuni.pdfIn PDF document text
    • http://balubusepebibi.rf.gd/vegedosipepazuninezipeba.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_off000105aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105AA 5308 bytes
SHA-256: 5fdb9ddca90ea84be12e35a75d23d137b5764cf246b80f9676a42c002b5fcd8e
font_01_sfnt_off0001178f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1178F 11008 bytes
SHA-256: fc7947d30ef17d7924f9c066d0385eae024215544fba572f33d9c44037479f84

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