Malicious PDF — malware analysis report

Static analysis result for SHA-256 9090c786cc70f3c5…

MALICIOUS

PDF

81.3 KB Created: 2021-06-04 16:04:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: b1e0b8d688344b26450b5d0873c2a801 SHA-1: 20bde5d9e294b8763f3c9fcacae05f8adb0c401d SHA-256: 9090c786cc70f3c5a4505cea84cfe0269f9ad20ec14c965f47d6d173a0ff80c4
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting services, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • 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.
  • 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://wastran.ru/pbw?utm_term=how+to+get+theta+on+casio+calculator+fx-991es+plus PDF link annotation
    • https://sidafixeruj.weebly.com/uploads/1/3/2/6/132681612/8669971.pdfIn PDF document text
    • https://sujufejunuvevu.weebly.com/uploads/1/3/2/8/132814923/8161e8adc0a.pdfIn PDF document text
    • https://guxipalun.weebly.com/uploads/1/3/1/8/131857363/zunukulovilumoxulek.pdfIn PDF document text
    • https://xekekulok.weebly.com/uploads/1/3/1/8/131857590/1365589.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375194/normal_5fd2cfdb36d26.pdfIn PDF document text
    • https://xuxukuked.weebly.com/uploads/1/3/5/3/135318060/bunifudevazikof.pdfIn PDF document text
    • https://kubazavazagemu.weebly.com/uploads/1/3/4/4/134464578/xabiwesoz_dawewi_fiwesuxipoma_bedusepol.pdfIn PDF document text
    • https://larebefol.weebly.com/uploads/1/3/4/6/134691273/2180003.pdfIn PDF document text
    • https://milalidit.weebly.com/uploads/1/3/1/4/131437162/domifa.pdfIn PDF document text
    • https://zudizobi.weebly.com/uploads/1/3/4/8/134860565/rokal.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452621/normal_5fdb19fe0f5b3.pdfIn PDF document text
    • http://edu.casio.comCASIOIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kepigiwup.pbworks.com/f/wugubuwufiw.pdfIn PDF document text
    • http://genarozep.pbworks.com/f/kovakixijevarupibovo.pdfIn PDF document text
    • http://nosegawibaso.pbworks.com/f/zentripetalkraft_aufgaben.pdfIn PDF document text
    • http://litorabi.pbworks.com/w/file/fetch/144498942/what_are_the_elements_of_plot_diagram.pdfIn PDF document text
    • http://wiwudoje.pbworks.com/f/56563924987.pdfIn PDF document text
    • http://savavaze.pbworks.com/f/how_long_to_study_for_teas_exam.pdfIn PDF document text
    • http://pazimonofe.pbworks.com/w/file/fetch/144461094/nisuteroramodawuwu.pdfIn PDF document text
    • http://mogulazedub.pbworks.com/f/minha_vida_fora_de_serie_3_gratis.pdfIn PDF document text
    • http://kunixove.pbworks.com/w/file/fetch/144484128/what_does_316_mean_on_jewelry.pdfIn PDF document text
    • http://bawamotijeku.pbworks.com/w/file/fetch/144560142/lasitibag.pdfIn PDF document text
    • http://lekuzax.pbworks.com/f/munaxurejamusewoj.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_off0000fee6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEE6 5640 bytes
SHA-256: 83d568d3579cdb1622f9041413423326505878576d745000ba2ffae75266bc98
font_01_sfnt_off00011231.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11231 10920 bytes
SHA-256: 0e4ddf1d96eff0bb117ba13e56d231dccfda8520594fea4cb5105fe167e56f0a