Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b79911b56008095…

MALICIOUS

PDF

84.1 KB Created: 2021-03-19 00:13:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: e87e076ec7b660fa6c2a88e6c8106a45 SHA-1: d009da41be46ba6558d78b6209339762d378d533 SHA-256: 9b79911b560080954284a566ffb3fcee3e12392b27e387d6b0ed9119804c099a
244 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier, specifically flagged as a redirector link and a link farm on disposable hosting. The embedded URLs, such as 'https://crophysi.ru/wix?keyword=tigerstar+and+sasha+escape+from+the+forest+pdf', likely lead to further malicious content or phishing sites. The document's structure and numerous external links suggest an attempt to manipulate search engine results or distribute unwanted 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
  • 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 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.
  • 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://crophysi.ru/wix?keyword=tigerstar+and+sasha+escape+from+the+forest+pdf In PDF document text
    • https://guxiwejibu.weebly.com/uploads/1/3/4/9/134902351/7cf5fa5f3.pdfIn PDF document text
    • https://pesiwuveso.weebly.com/uploads/1/3/5/3/135392822/mekenukujirar_pebalukad_bupudojo_gulevukapi.pdfIn PDF document text
    • http://tijukilebag.getenjoyment.net/ctet_syllabus_paper_2.pdfIn PDF document text
    • https://moxatabik.weebly.com/uploads/1/3/4/8/134885740/c18a93d11f.pdfIn PDF document text
    • http://dragonflysagewellness.com/the_goal_of_psychology_is_toa6fn3.pdfIn PDF document text
    • https://nolutoxut.weebly.com/uploads/1/3/4/6/134683805/c0895.pdfIn PDF document text
    • https://kikosezuzo.weebly.com/uploads/1/3/1/3/131378972/zivasonumusivozoxo.pdfIn PDF document text
    • https://nuravodabola.weebly.com/uploads/1/3/0/7/130740537/demuxebifutaxe-xavurumut-radijarejumu.pdfIn PDF document text
    • https://jipunexekamu.weebly.com/uploads/1/3/4/5/134588935/jenedakebalaluk_wusulufukuw_ligobe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368246/normal_5fec934538ea8.pdfIn PDF document text
    • https://wivewuti.weebly.com/uploads/1/3/4/6/134698804/311018.pdfIn PDF document text
    • http://barcaporirternet-interbank-pe.com/158564926837dv9m.pdfIn PDF document text
    • https://xonajuximo.weebly.com/uploads/1/3/5/3/135311854/zofine_zazum_piminif.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376874/normal_5ff1fc5dcc5c8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387243/normal_5fd160db2e49e.pdfIn PDF document text
    • http://getplafond.xyz/how_to_writing_technical_papercwvj8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496812/normal_603c791c1cdf7.pdfIn PDF document text
    • http://wijasagasipode.getenjoyment.net/cahn_ingold_prelog_rules.pdfIn PDF document text
    • https://mopobaseburole.weebly.com/uploads/1/3/4/8/134859053/c3aadd75f8ea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368221/normal_603021f348ea7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://fa5d8e44-005d-4c05-925d-ba60cb7f5023.filesusr.com/ugd/121e37_4e391a3085fd4c42ba665abcc65564a5.pdf?index=trueIn PDF document text
    • https://ef2e072a-e8a2-4438-804d-cc750be2e2f6.filesusr.com/ugd/6a22cb_cb57492b94b441bcb0afc9d5464721a8.pdf?index=trueIn PDF document text
    • https://b7e73dfe-ad35-4791-b4f7-7500f5b7882c.filesusr.com/ugd/bc79a4_016e397e8600479bb853fc573de68e07.pdf?index=trueIn PDF document text
    • https://d8acad56-eb9a-42d1-a06c-a695c5b02328.filesusr.com/ugd/0ad6c7_2b4459c0a8554b3c9830ad843f901848.pdf?index=trueIn PDF document text
    • https://ac6a5e95-3fab-4d4b-a7e7-0ef4c71e5929.filesusr.com/ugd/32c278_e3ae132763af4281ab6145d21932ad15.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f5b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B7 4220 bytes
SHA-256: d244ed5329de784a4587a806687faa68429b2dc261cd8e3bccde2e0eb4ddd8ca
font_01_sfnt_off00010470.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10470 5488 bytes
SHA-256: a857c049db159e426d440fda49221572f3583a57cbc7850dda50714408a1b47d
font_02_sfnt_off000116f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116F4 13688 bytes
SHA-256: 26ab06c4e72516bad32bdf5ff68ce867f305ab261bf815a55718fc4502594382