Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a04acfd00a93651…

MALICIOUS

PDF

73.6 KB Created: 2021-02-27 15:29:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: fa050c59cc727293ed717ad5d9a74bea SHA-1: 9a177976fc3110c269f938ae9e38efe69ac12e9a SHA-256: 7a04acfd00a93651b02f14008cabb1bb55aa3f596e2c9f5c9195263df8a7ed54
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to various PDF files hosted on disposable domains and link farms, indicating a likely SEO manipulation or content distribution scheme. ClamAV detected this as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The presence of external URIs and link farm heuristics strongly suggests a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://jottigo.ru/award?keyword=literary+criticism+essay PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4496602/normal_5feb983368377.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420222/normal_601fa08e693bf.pdfIn PDF document text
    • http://obzorov.site/zudifidaromizof1tcwz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367646/normal_6033f75b8ff1a.pdfIn PDF document text
    • http://opensoda.pro/password_safe_ubuntuf7m5k.pdfIn PDF document text
    • https://cdn.sqhk.co/vutowogipu/gen1ign/teachers_pay_teachers_bitmoji_classroom_template_free.pdfIn PDF document text
    • http://bestpriceforukraine.xyz/30306202943l3hw6.pdfIn PDF document text
    • http://cashfree.store/47775073832vpfvy.pdfIn PDF document text
    • http://prizinsta365.website/wejesokorw8f7.pdfIn PDF document text
    • http://drive4mclaneaustell.com/xufoxit96tfc.pdfIn PDF document text
    • https://cdn.sqhk.co/bovokolel/8fjero0/super_mario_kart_switch_sale.pdfIn PDF document text
    • https://cdn.sqhk.co/mivuxakadu/Ahg2iiL/soul_hunters_wiki_heroes_tier_list.pdfIn PDF document text
    • http://afracheat1.xyz/telefono_informazioni_amt_genova3mdyr.pdfIn PDF document text
    • https://cdn.sqhk.co/kasavakujosi/cc9kIaT/tapivekejigawufutolava.pdfIn PDF document text
    • https://cdn.sqhk.co/kawonidoza/f9hegg0/las_vegas_casino_with_most_slot_machines.pdfIn PDF document text
    • http://sayfelengs.space/insert_multiple_sheets_in_excel_2016cpanz.pdfIn PDF document text
    • http://nuverlites.online/36810642441uc8db.pdfIn PDF document text
    • https://cdn.sqhk.co/puxolika/drgfrgP/39793666467.pdfIn PDF document text
    • http://wonder-ita.fun/nunamufemeghxq8a.pdfIn PDF document text
    • http://citimart.online/advanced_bionics_vs_cochlearbs9qu.pdfIn PDF document text
    • http://graatorama.fun/download_youtube_app_for_androidq8psi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000e598.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE598 4956 bytes
SHA-256: 91d8dc962ba82859753c7586f401040c36989580112de6b5bd6c25eb37d695b2
font_01_sfnt_off0000f66a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF66A 10240 bytes
SHA-256: 4f493c56c42dbde93a0be69c056f4d17ec5ee779ef983b60bb41aad119c696c6

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