Malicious PDF — malware analysis report

Static analysis result for SHA-256 5136fb854401456e…

MALICIOUS

PDF

82.7 KB Created: 2021-04-11 01:03:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: c095f3690c78f815ddf7c32c211c1014 SHA-1: 2f397486d2421bdf25ea438ebac14ca6b2eef6eb SHA-256: 5136fb854401456e1aeff6d95f9561271c78b8238a7e4837fdbd6eed11114566
186 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many of which are hosted on disposable domains, suggesting a link farm or phishing attempt. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the PDF structure and embedded URLs point towards a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://zajinet.ru/strik?utm_term=what+supreme+court+cases+are+coming+up PDF link annotation
    • http://vannabanyavsedela.xyz/rewejesirumurirusufutapommy62.pdfIn PDF document text
    • http://vipadobotisituz.mygamesonline.org/26066680918.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419204/normal_5fecbf2be8f09.pdfIn PDF document text
    • http://twenty-promo2020.ru/bosch_gts_10_xc_specsce0sl.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446272/normal_60617c074ef55.pdfIn PDF document text
    • http://vepenuvix.mygamesonline.org/russian_words_and_phrases.pdfIn PDF document text
    • http://saniwigudovo.scienceontheweb.net/belapur_housing_analysis.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461207/normal_5ffd5964ce5f6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379969/normal_5fc663a2848f6.pdfIn PDF document text
    • http://parkji5x.xyz/can_an_illegal_immigrant_have_a_drivers_license566yf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://c84d532c-3b33-47d6-96aa-4134a1164eb1.filesusr.com/ugd/6d45f6_f3d64b94f9a4485e92cdb74bafb7d424.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f84b821-84a4-44d3-8ebc-64b6d275a796/samsung_55-inch_q60r_4k_uhd_qled_smart_tv_manual.pdfIn PDF document text
    • https://19e6fc83-c281-4d06-93fd-e8b16a02b90a.filesusr.com/ugd/ce5d00_19e8822195c94510b71cb16aa8bae011.pdf?index=trueIn PDF document text
    • https://5902ff30-e651-486c-ac37-3e8383bfa78f.filesusr.com/ugd/f35da0_acf2071abd6a401cb8b62bede612bf8b.pdf?index=trueIn PDF document text
    • https://59bb578d-b312-442a-858b-1a1a54b18a6c.filesusr.com/ugd/c79b1c_8fb38e1e2da949e9b64f143c9fbb7353.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1324f7ab-7b1a-4cd8-8fad-5250825d08a8/1995_polaris_sportsman_400_top_speed.pdfIn PDF document text
    • https://e1cf253b-b3af-4135-a675-1c3c021177f9.filesusr.com/ugd/111c46_414c4e1264b4418b95b912ceed086a25.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6102bea1-ed88-4441-a826-704641eeadee/37318792247.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d5181a99-ca75-4026-97dd-b935b1366722/rhythm_exercises_online.pdfIn PDF document text
    • https://2e8e3215-33bf-4fe1-bc67-b38dac560527.filesusr.com/ugd/269bb8_4ed42663498244acb77af183f894abd3.pdf?index=trueIn PDF document text
    • https://bc5ba30c-e427-49eb-abc4-9677f18f04c1.filesusr.com/ugd/bcd086_3478fa5ed78e4f32bd35f664d56a4404.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/bfcbe93b-adbc-490e-bd7d-f20821521b4e/how_does_energizer_battery_charger_work.pdfIn PDF document text
    • https://69f6cc44-9198-4e41-bafa-43503dba92bf.filesusr.com/ugd/dec231_294c98681b3147ffa7b50ef0fa34d099.pdf?index=trueIn 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_off000107ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107FF 5328 bytes
SHA-256: c432047cb6fcc2b7830a9ee981423f237d62ab56adff5ba709f5740c75cd24b4
font_01_sfnt_off00011a04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A04 10348 bytes
SHA-256: d53535ae92e3727a66ab46b85ac5139dd18a6a49309eb2b4ee98e3d105a61f09