Malicious PDF — malware analysis report

Static analysis result for SHA-256 c11cb2a0cb874410…

MALICIOUS

PDF

93.7 KB Created: 2021-05-18 16:08:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: ce6c215cfa7231ac1318c748ae88ad9d SHA-1: b26371ca39e909d79252355ae6cc791fd5d15fef SHA-256: c11cb2a0cb8744106e647203dcf476ba815fa1f4fb8e2fb04879453be741ce30
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains multiple embedded links, with one specifically identified as a malicious redirector pointing to 'https://yafferge.ru/strik?utm_term=olaf+frozen+adventure+full+movie+subtitle+indonesia'. This suggests the document is designed to lead users to malicious sites, likely for phishing or to download further malware. The presence of numerous links on disposable hosting further supports a malicious intent.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=olaf+frozen+adventure+full+movie+subtitle+indonesia In PDF document text
    • https://cdn-cms.f-static.net/uploads/4411717/normal_60106a41c3c88.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383582/normal_5fcefd7877537.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373301/normal_6021974068403.pdfIn PDF document text
    • https://zunimivivonuz.weebly.com/uploads/1/3/4/0/134017399/nupijadopigiletegu.pdfIn PDF document text
    • https://xozipirun.weebly.com/uploads/1/3/5/3/135324749/julesosobo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386836/normal_604a685f69046.pdfIn PDF document text
    • http://kufudizaja.22web.org/22943033869.pdfIn PDF document text
    • https://dilukali.weebly.com/uploads/1/3/4/5/134584555/89300.pdfIn PDF document text
    • http://sibasijiv.22web.org/blue_bossa_guitar_solo_tab.pdfIn PDF document text
    • https://dofazodasi.weebly.com/uploads/1/3/0/8/130873943/lokuwezolev_woxek_gosun.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://foxejozigigep.rf.gd/oculus_definition_architecture.pdfIn PDF document text
    • http://gawevoniko.rf.gd/the_first_90_days_template_excel.pdfIn PDF document text
    • http://vubixegigag.rf.gd/bi_ht_thiu_nhi_v_gia_nh.pdfIn PDF document text
    • https://s3.amazonaws.com/zebarufuridorur/63513848618.pdfIn PDF document text
    • https://s3.amazonaws.com/dewazewokib/lenovo_thinkpad_t430s_recovery.pdfIn PDF document text
    • http://bexumasifawej.epizy.com/banished_free_full.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c9d7e2c8-9278-425c-a3d9-eb197d9c5afa/how_to_write_possessive_nouns.pdfIn PDF document text
    • https://s3.amazonaws.com/vojapu/dynamics_crm_dynamic_worksheet_import.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/53fcc9b1-465e-40ec-8376-1c0285e24129/bipaxizovujotujibabemejov.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_off00012d19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D19 5332 bytes
SHA-256: 766bffde782d46abadbe0e3c9ea0029d064270f2804c3f8f5e04a63c10929a41
font_01_sfnt_off00013f32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F32 13160 bytes
SHA-256: 0211140ef0283c2e49944fe5a64ae4de7689e55acb5edffe24a6765f635b7a1a

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