Malicious PDF — malware analysis report

Static analysis result for SHA-256 a790a3c09a085461…

MALICIOUS

PDF

70.9 KB Created: 2021-03-02 22:08:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 45482841722c1fe8b7e0c0960003b22b SHA-1: 30f74c2af08626b57a855709cf56590b153644b9 SHA-256: a790a3c09a085461c8196cbd5e13d6e0dc6ba8af025432eae31ca15f740207cf
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, identified by the PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics, pointing to various PDF files hosted on disposable domains and services like Weebly. The ML_NYX_PDF_MALICIOUS and ClamAV detections strongly indicate malicious intent, likely related to phishing or distributing further malware through these links. No scripts were extracted, but the primary attack pattern involves redirecting users to a network of malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jacksth.ru/award?keyword=questions+for+lord+of+the+flies+chapter+12 PDF link annotation
    • https://cdn.sqhk.co/jedepazisu/nhjurih/zojawusiz.pdfIn PDF document text
    • http://brettlockhart.com/acrylic_mirror_sheetsuic3b.pdfIn PDF document text
    • http://com-servers.online/surolelefanov4v.pdfIn PDF document text
    • https://fifurinirolegif.weebly.com/uploads/1/3/5/3/135306558/najamekefu.pdfIn PDF document text
    • https://wemupubipu.weebly.com/uploads/1/3/5/3/135331653/kogari_zodunavewa_mujaxiluliwiruw_tupinevutepami.pdfIn PDF document text
    • https://voxonased.weebly.com/uploads/1/3/1/4/131407877/vexukazezasu.pdfIn PDF document text
    • https://finolija.weebly.com/uploads/1/3/4/6/134625313/vemiti.pdfIn PDF document text
    • https://pitazifuriza.weebly.com/uploads/1/3/0/9/130969431/6138625.pdfIn PDF document text
    • http://nowanedilado.22web.org/c_function_pointer_to_template_function.pdfIn PDF document text
    • https://pufopobumosuv.weebly.com/uploads/1/3/0/7/130776602/9eaccfb846.pdfIn PDF document text
    • https://cdn.sqhk.co/monubinejon/bDogjgd/rabetidomu.pdfIn PDF document text
    • https://dadekubezaxinis.weebly.com/uploads/1/3/2/7/132740399/e76e495.pdfIn PDF document text
    • https://cdn.sqhk.co/numavagoko/icjjAjg/growtopia_wiki_prices.pdfIn PDF document text
    • https://zabaparadasikid.weebly.com/uploads/1/3/4/3/134317604/1a8e490745d.pdfIn PDF document text
    • https://fometixivoros.weebly.com/uploads/1/3/1/6/131637143/7480154.pdfIn PDF document text
    • http://idealica-italy.site/sufukixunomutarj0zqw.pdfIn PDF document text
    • https://cdn.sqhk.co/togokitaz/hhhggh3/xibutajev.pdfIn PDF document text
    • https://jirozonuk.weebly.com/uploads/1/3/1/6/131606844/solodopal_gipol_tesasuvozab_mukibiwerimu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tanijug.rf.gd/72756847183.pdfIn PDF document text
    • http://vugapadilubokis.epizy.com/graphics_design_course_outline.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_off0000d854.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD854 5488 bytes
SHA-256: 358c9c8efc6cdfd3528757e7e976259ef4cda753a5e63321223559603bb18468
font_01_sfnt_off0000eb00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB00 10136 bytes
SHA-256: 5aa34aca271da7b8b9f86d4fb5352b9fc59822c0641218e500b5af3dbd4a498b

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