Malicious PDF — malware analysis report

Static analysis result for SHA-256 227d9961f0c2f2c8…

MALICIOUS

PDF

73.0 KB Created: 2021-02-15 08:39:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: a8a0aa83d775f1d58c9d06a2375f64e1 SHA-1: 32b940b79aa67283ef9376e06a22ac647d920f43 SHA-256: 227d9961f0c2f2c8255e8658d5fa73faa4b51635ca4851b981404f04e236beeb
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, many hosted on disposable domains, suggesting a link farm or phishing lure. The PDF structure and embedded URLs point towards a spearphishing attachment attack pattern, aiming to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://leonvi.ru/123?utm_term=another+word+for+hard+worker+on+resume PDF link annotation
    • https://cdn.sqhk.co/luwivimexu/hg1ShgP/os_x_nethack_download_mac.pdfIn PDF document text
    • https://cdn.sqhk.co/lajefage/bicqa8L/english_stories_to_read.pdfIn PDF document text
    • http://santaparker.store/5259445882533gu4.pdfIn PDF document text
    • http://verifedform.com/bandish_pk_song5ihsp.pdfIn PDF document text
    • https://cdn.sqhk.co/rafumufo/dAjdCid/ionity_charging_cost.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479223/normal_601ed9f0caca2.pdfIn PDF document text
    • http://kkkirrreeee.space/idate_commission_reportr9k8l.pdfIn PDF document text
    • http://siondez.ru/difuvuzi2t8qm.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416144/normal_5fe3a04a39919.pdfIn PDF document text
    • https://cdn.sqhk.co/vopofuxo/cjddjg9/descargar_no_crop_for_instagram_apk.pdfIn PDF document text
    • http://jopkapopka.online/3x3_rubik_s_cube_algorithm_sheetgnqnb.pdfIn PDF document text
    • http://repair-monokoles.ru/vipikep876u.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368249/normal_5fffa4461bad2.pdfIn PDF document text
    • http://mikrotikwizard.com/zisukuxozulokejerbl1eq.pdfIn PDF document text
    • http://googsnat.space/xidatuzitunabusuguxuwokasr9wt0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/vuzotisenixava/felopuxovisikaxarafo.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_off0000e1ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1AD 5260 bytes
SHA-256: 694ffba7de77979c07204607ffa9ec74bf847b23929df22d346168717d0cb715
font_01_sfnt_off0000f379.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF379 10356 bytes
SHA-256: 71e68e71ec5b127118e16aa3151ab23b22940e5e1487bab75a118bcf7cfa5014

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