Malicious PDF — malware analysis report

Static analysis result for SHA-256 53277de4ebf0ef09…

MALICIOUS

PDF

88.2 KB Created: 2021-03-09 02:45:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: ddb6682560882c53ed9a7673a178aed3 SHA-1: dd77e6085a5bd2369a6548f50fb7292c5046f86a SHA-256: 53277de4ebf0ef09194793da7bb1c688472438fb5122cd779eff9b0c9b9aac1c
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. While no scripts were directly extracted, the PDF structure and embedded URIs point towards an attempt to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://xajibur.ru/award?keyword=strain+gauge+pressure+sensor+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4405950/normal_5fcf43160996a.pdfIn PDF document text
    • http://degujub.iblogger.org/a_speakers_guidebook_text_and_reference_6th_edition.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490376/normal_6024031e93352.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415308/normal_6011fb4015418.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393346/normal_5fd287a2a865d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vorasiwusiga.epizy.com/gutuwabigukozelodemixare.pdfIn PDF document text
    • http://kikodanaso.epizy.com/how_to_detect_firewall_in_network.pdfIn PDF document text
    • http://fuvezijejek.epizy.com/vawibusibusopitagon.pdfIn PDF document text
    • https://df6a9abb-74f3-47e1-b359-fe6d1019da36.filesusr.com/ugd/7921d2_2357933128bf4174a641ebbca7337e1b.pdf?index=trueIn PDF document text
    • https://3c4962d9-41f7-4f14-8396-dad57cc8de20.filesusr.com/ugd/a2de88_124c445daf3a4c6bb7354bb38cab3570.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/de253ef9-63d1-4f65-8642-a3034e1a3e41/tom_clancy_executive_orders_ebook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e822b078-4a0e-4c04-a30d-5622492253d8/nisabokejejita.pdfIn PDF document text
    • https://76ed6b59-b034-43ac-b949-e1c08f76e3cb.filesusr.com/ugd/ee6100_7d4d73f08bcf4e62b97a3cbfe3424d7e.pdf?index=trueIn PDF document text
    • https://b3dfd9c9-1030-471f-a26d-814ea73dbccc.filesusr.com/ugd/d97afa_a673b6e6af804d33bd55b17bd31f91eb.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ad53ac3-8370-4266-b7fa-97b4515d1913/how_to_sew_a_diy_fabric_face_mask_-_free_printable_pattern.pdfIn PDF document text
    • http://fubolorira.epizy.com/tp-link_nano_powerline_adaptor_starter_kit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/442ddb65-091d-4a73-91e9-96a9e1177dce/febazisatisivaf.pdfIn PDF document text
    • https://7c5e2310-e79b-429e-9f4a-70471a43dcce.filesusr.com/ugd/8ec1ef_e2c48e7acaa84d6eb10a0b9ed91def95.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0475e42b-6d65-4290-8961-a0aae10dd17e/71389979999.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac794e41-2630-41e4-8bf5-ee7fd27dbee2/93351238246.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b62bd9f-902a-43af-8aff-a31b7c708e57/bonjour_tristesse_poem_english.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c12a58c0-9964-4482-9d91-257268791420/dofuwulubupujaxakunisa.pdfIn PDF document text
    • http://kadonimefimewe.rf.gd/kolkata_weather_report_now.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/27df19ec-efcf-47b3-9c7d-f26af8a9604e/general_knowledge_quiz_2020.pdfIn PDF document text
    • http://vavikanepib.rf.gd/73552879283.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_off00011b0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B0B 5280 bytes
SHA-256: a71c4fe99292fcfee643d7b7d0eb6737f1b8261b6332031dbe562c0f5b6121b4
font_01_sfnt_off00012d0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D0C 11184 bytes
SHA-256: 51e9b2bb7be3cbf9c20d796a3e00bcf3b902d8605c25d3782fedcc044bb2e8a5