Malicious PDF — malware analysis report

Static analysis result for SHA-256 676cae25c5bfd46c…

MALICIOUS

PDF

82.9 KB Created: 2021-04-09 04:03:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 4b81e8da9f88a9f7f9df675f607429e1 SHA-1: 72654ba4c61ec4ea57870c5a388ae4498c7e982b SHA-256: 676cae25c5bfd46c0752d9d94a785fb0f162a809bed5beabf1a441785479529c
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically as a phishing trojan. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing campaign. While no scripts were explicitly extracted, the PDF structure and embedded URLs indicate an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://soxebez.ru/strik?utm_term=what+are+the+types+of+grounding PDF link annotation
    • https://cdn.sqhk.co/zikegasenar/vkSijgE/golf_galaxy_in_warwick.pdfIn PDF document text
    • https://cdn.sqhk.co/pulovafafita/qkS8lhb/the_blockheads_apk_hack.pdfIn PDF document text
    • https://xumizobizuzu.weebly.com/uploads/1/3/4/6/134688834/c80a8.pdfIn PDF document text
    • https://cdn.sqhk.co/temetixufuxi/gjjTphd/spell_street_cred.pdfIn PDF document text
    • https://runuwafulisejet.weebly.com/uploads/1/3/5/3/135337902/gotexokimazemep.pdfIn PDF document text
    • http://vesajob.getenjoyment.net/likinatufifegelu.pdfIn PDF document text
    • https://fexifeter.weebly.com/uploads/1/3/4/6/134612515/wikefuvugagubix-sarujit-panedeten-miwadadumasob.pdfIn PDF document text
    • https://cdn.sqhk.co/jigitovewuk/hdPifhd/18678424797.pdfIn PDF document text
    • https://nizuwutino.weebly.com/uploads/1/3/1/4/131482859/1685903.pdfIn PDF document text
    • http://rasipafus.getenjoyment.net/blood_relation_question_download.pdfIn PDF document text
    • https://movireralu.weebly.com/uploads/1/3/4/8/134879142/b60a0.pdfIn PDF document text
    • http://ramuwesitavoz.mywebcommunity.org/computer_architecture_and_assembly_language_notes.pdfIn PDF document text
    • https://voxipomawo.weebly.com/uploads/1/3/1/3/131379395/vakodawuzibar.pdfIn PDF document text
    • https://talegojozafadi.weebly.com/uploads/1/3/2/3/132303005/wunujezogaposexaj.pdfIn PDF document text
    • http://fawikenaxalu.scienceontheweb.net/intercessory_prayer_bible_verses.pdfIn PDF document text
    • https://cdn.sqhk.co/selodiro/cFivWwD/poxavolakugu.pdfIn PDF document text
    • http://wulixiv.sportsontheweb.net/kupidawelap.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/05aaae99-dcd5-44ee-9e10-e18a854455a1/how_old_is_snow_white_prince_age.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec3be164-b70e-4ceb-8fae-3f54c769cb24/dikesudup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/89257241-ba70-465d-b883-0198cf05c88c/vududujudazegigajumuzulek.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f6451c4b-f068-4f98-aac5-38be8bfadc4c/zonirobajolosuverubevo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a8e7949-0a3f-404d-94e8-4085628178b3/estrategias_de_lectura_y_escritura_para_segundo_grado_de_primaria.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f352c4d-4376-44ff-aea9-56f855fef709/8524957886.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f0e69dd8-c0f1-4845-93a7-814458a64a74/35898402259.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/20df6fba-b5a7-4987-b72c-86dcdfa03377/how_to_use_external_flash_nikon_d3400.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f90cf6f-12cb-4494-8a55-a4d19744b968/vabevipe.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f5d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5D1 5268 bytes
SHA-256: df009d7994477839c0bb742430de669cedec357ee674e3883232dcbe2e99920d
font_01_sfnt_off000107cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107CC 11164 bytes
SHA-256: 77ba77110e704d91e37ce0c5a895d9919ebdf2b53fce2565beeb3b3fa120c6da
font_02_sfnt_off00012dca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DCA 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176