Malicious PDF — malware analysis report

Static analysis result for SHA-256 5318fa681aa7c033…

MALICIOUS

PDF

72.5 KB Created: 2021-04-12 16:48:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 0540b117c43e3337542b541056123e05 SHA-1: 7a37556520004b52c733e79cd2de6c636520dc72 SHA-256: 5318fa681aa7c0339c0fb65550e6624b7386654745e560f56f5a1fdc4213030c
184 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable hosting and redirector infrastructure, as indicated by the 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the nature of the embedded links and the PDF structure suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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
  • 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=whirlpool+dishwasher+wdf320pads1 In PDF document text
    • https://static.s123-cdn-static.com/uploads/4465127/normal_5fcf43f3204a6.pdfIn PDF document text
    • http://xomutukegadoj.mypressonline.com/9th_grade_math_book.pdfIn PDF document text
    • http://skidki-day.store/kebevojogeton623ll.pdfIn PDF document text
    • http://letxxnx.org/gamemaker_studio_2_platformer_tutorial_dndrybkh.pdfIn PDF document text
    • http://suruwafid.22web.org/xepevawuvebofadebago.pdfIn PDF document text
    • http://eurostore.info/86947265918pwig0.pdfIn PDF document text
    • http://dimax.website/adolescence_steinberg_12th_edition_ebookkc9eh.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417313/normal_600d12a214ae2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416938/normal_6053258605f4c.pdfIn PDF document text
    • http://janorewaxeno.mygamesonline.org/agile_methodology_scrum_definition.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382638/normal_600654f335752.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367290/normal_602dcd601a5a6.pdfIn PDF document text
    • http://microbestdigitalmeter.xyz/midubiwinuripoqljw0.pdfIn PDF document text
    • http://hookup668.site/western_freeway_traffic_report_today8oqe9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/b47d7d8a-bf1c-4b5c-96e5-f9c7f58e5492/how_to_use_pellets_in_a_masterbuilt_electric_smoker.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a8af89c8-960a-4b2c-9366-7b7bd7b443cb/tinorasarik.pdfIn PDF document text
    • http://gurabagoderes.atwebpages.com/3rd_grade_english_worksheets_free.pdfIn PDF document text
    • http://suvubojetixag.epizy.com/belif_whitening_facial_sheet_mask.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/75ed851b-be05-4587-a52a-623da6807346/wekiwifaperutagiwanulolep.pdfIn PDF document text
    • http://jawegoxizifiti.epizy.com/wage_garnishment_calculation_worksheet.pdfIn PDF document text
    • http://jorelodifi.rf.gd/rivovetovopojotuda.pdfIn PDF document text
    • http://merivitewije.rf.gd/42327226085.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_off0000dde8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDE8 5724 bytes
SHA-256: d62953e0da090c1e4ac094d626262c0832abad2fd33c600e33886beda49af698
font_01_sfnt_off0000f17a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF17A 10216 bytes
SHA-256: 7a2377c63c09dd53dd2612a59594a3a120f47b0fc858564b0c54e1f6fd9cb3a9

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