Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7d8b7897b0a14b2…

MALICIOUS

PDF

75.8 KB Created: 2021-03-01 08:09:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: bbaf707f74a55f9f504280102540ff00 SHA-1: c417ada062ed803123d77c17791f7ba60247b1e1 SHA-256: e7d8b7897b0a14b2e3025bf1f0ac21ade86d72f3088f5581d145e4a7f6ddf1fb
194 Risk Score

Malware Insights

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

The PDF document contains a large number of external links pointing to disposable hosting services, indicative of a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and embedded URLs point towards a malicious workflow.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://mezovuduw.ru/strik?utm_term=what+is+p%252Fd PDF link annotation
    • https://tupivoxutod.weebly.com/uploads/1/3/4/4/134467409/bowafedij.pdfIn PDF document text
    • http://lulezuzebat.22web.org/nawabaxexesarewaxemugir.pdfIn PDF document text
    • https://xavujome.weebly.com/uploads/1/3/0/7/130739328/1912.pdfIn PDF document text
    • https://fidimamafiw.weebly.com/uploads/1/3/4/6/134624465/3a56d5037a0.pdfIn PDF document text
    • https://xowunaxevome.weebly.com/uploads/1/3/4/6/134679103/koxokepanir_tuteradovej_patiro.pdfIn PDF document text
    • http://lojapidabud.mypressonline.com/zukefewepizijobidetatikon.pdfIn PDF document text
    • http://kavademive.sportsontheweb.net/44774301995.pdfIn PDF document text
    • https://farunigi.weebly.com/uploads/1/3/4/7/134716297/wazekoxa.pdfIn PDF document text
    • http://sanasesuj.iblogger.org/all_video_er_free_app.pdfIn PDF document text
    • https://cdn.sqhk.co/noxibogalu/bjhethf/81870146436.pdfIn PDF document text
    • https://cdn.sqhk.co/samivegin/ghkhivq/47918376039.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vuropomap.epizy.com/how_do_you_use_chick_fil_a_owners_make.pdfIn PDF document text
    • http://mutifesojare.epizy.com/piano_beginners_songbook.pdfIn PDF document text
    • https://s3.amazonaws.com/posufij/chomsky_competence_and_performance.pdfIn PDF document text
    • https://s3.amazonaws.com/zobuwubedak/lizopejelazuv.pdfIn PDF document text
    • http://pudolajuji.atwebpages.com/financial_accounting_equation_cheat_sheet.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_off0000ec45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC45 4968 bytes
SHA-256: c91ffdc6289dcdda8bfb880bf90d82352fdb2bfde25f8a6afb6c13625ffcdac0
font_01_sfnt_off0000fd41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD41 10884 bytes
SHA-256: 9f8356c1e57498e17574ce2b8baec7acbf25da583c8221a4f37a4b32474b7ac7

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