Malicious PDF — malware analysis report

Static analysis result for SHA-256 458b7c8638ff3e28…

MALICIOUS

PDF

80.8 KB Created: 2021-03-27 15:17:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: db341c82399973847df85ef9faab2dc7 SHA-1: a1937c96e79b1d22898c7d4dda23812628eb458a SHA-256: 458b7c8638ff3e2822a6d3d80132abfd393ef392cf0ed8443fddc79ab53d1da6
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link T1059.007 JavaScript

The PDF contains multiple embedded links, with at least one pointing to known malicious redirector infrastructure (https://dafemum.ru/strik). The ML classifier and ClamAV detection strongly indicate malicious intent. The document body is heavily obfuscated, but the presence of numerous links suggests a phishing or malware distribution lure.

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://dafemum.ru/strik?utm_term=cloud+atlas+book+review+goodreads In PDF document text
    • http://bobatukuxoto.iblogger.org/migemadibud.pdfIn PDF document text
    • http://miwipagodu.22web.org/stem_lesson_plan_template_elementary.pdfIn PDF document text
    • https://xidoferowugefu.weebly.com/uploads/1/3/4/3/134348033/9e2c2c5.pdfIn PDF document text
    • https://roxewakedenal.weebly.com/uploads/1/3/1/4/131483042/d0f3b72.pdfIn PDF document text
    • http://1fps.ru/pricing_procedure_account_key_tcode_in_sap_mmcwr2f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456998/normal_6048f42399f89.pdfIn PDF document text
    • http://shishkin-seed.xyz/law_of_property_act_1925_section_109lpxl7.pdfIn PDF document text
    • http://reduslimitaly-official.website/vivodavulezujokeweruwenubc9hwv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447085/normal_600e0b4b09a6c.pdfIn PDF document text
    • http://ripotomip.iblogger.org/arduino_bluetooth_android_app.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jutebef.rf.gd/16461072772.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c8b218f5-0725-4d46-8048-7eb5aa4fa05b/89507972779.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/29804854-595d-41e3-a03f-8315b711d1d5/kemalikokawura.pdfIn PDF document text
    • http://gowasofejav.rf.gd/22264252737.pdfIn PDF document text
    • http://fevakizifawe.rf.gd/gurajijaniz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/87dd9f7c-1d0c-4fdd-ba05-d48c1aec2b6f/nokix.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_off0000feba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEBA 5252 bytes
SHA-256: e875a37422086fcfc27fb7b37736f1472d9bc24c2f83e82d053a8f2a6f1ab64c
font_01_sfnt_off000110b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110B5 10968 bytes
SHA-256: 634d214192d54d72d8106a1abb2606408b0d46310b2420c4ed090be9e82bce15

Open this report in the interactive analyzer, or submit your own file for analysis.