Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9bb0180333d9c5a…

MALICIOUS

PDF

86.8 KB Created: 2021-02-16 22:00:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 72cde64ddfca7df42ce549f0ccc5fea3 SHA-1: 46c23bdbc1c6a24b5b17122bb04d11b29c01a753 SHA-256: c9bb0180333d9c5ad689b387480ae4c69f153087c5b8d797810439d33a0138c3
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one specifically identified as a malicious redirector. The document body, though heavily obfuscated, suggests a lure related to 'Integrated Chinese 2 4th edition workbook answers'. The presence of a malicious redirector and the ML classifier's high confidence score indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 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://yafferge.ru/aws?utm_term=integrated+chinese+2+4th+edition+workbook+answers In PDF document text
    • https://cdn-cms.f-static.net/uploads/4481164/normal_5fd6982f26a85.pdfIn PDF document text
    • https://jekomijijupuda.weebly.com/uploads/1/3/1/4/131438685/vomujux-miriduleg-laxogaxirav-lateturav.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450721/normal_5fe3a7059c6c5.pdfIn PDF document text
    • http://mini-cam-v2.club/mtg_does_first_strike_work_blockingf9r6d.pdfIn PDF document text
    • http://fitokaps.xyz/pewukigcjvqw.pdfIn PDF document text
    • https://wiruwopifezub.weebly.com/uploads/1/3/4/3/134345133/rasifisesomu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493867/normal_6013ecba801c5.pdfIn PDF document text
    • http://sefesojobibif.iblogger.org/easy_platform_game_maker.pdfIn PDF document text
    • https://sudarotabodubig.weebly.com/uploads/1/3/1/4/131407445/ab3d9aa4dff04.pdfIn PDF document text
    • http://1xbets-regs.site/watch_haru_matsu_bokura_live_action9zttn.pdfIn PDF document text
    • https://gasezojilatinoj.weebly.com/uploads/1/3/1/4/131455825/rebuvupufejitapo.pdfIn PDF document text
    • https://junerokiwoji.weebly.com/uploads/1/3/0/7/130775834/3448ef954d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428035/normal_5fd13a131c527.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://banobozibijur.epizy.com/org_chart_template_excel_2013.pdfIn PDF document text
    • http://nadezuj.epizy.com/pbisworld._com_check-_in-_check-_out_form.pdfIn PDF document text
    • https://s3.amazonaws.com/kugelilizibuwum/64577238151.pdfIn PDF document text
    • https://s3.amazonaws.com/lanaladu/2513333517.pdfIn PDF document text
    • http://bekapoza.epizy.com/gatupiliforexuxolujuve.pdfIn PDF document text
    • https://s3.amazonaws.com/doxifuba/zipufovekoxupinodur.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00011f07.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x11F07 26208 bytes
SHA-256: cf6adf5c2646ca361a3b5ac03e175bee2d878abb6c07e15dc62a79b75c15ffd9
font_00_sfnt_off0000e76a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE76A 5624 bytes
SHA-256: 872c790306759d1ac31eb668be03b397d28e22044303edecc63f36c839c73ab1
font_01_sfnt_off0000faa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAA0 10644 bytes
SHA-256: ad4acf50264bc8a972b845812c48fffe49f53f35fed28eaa0583c181658581bc

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