Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e09130a94b4ec11…

MALICIOUS

PDF

68.5 KB Created: 2021-02-14 12:52:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 3a4f38498b6a0ec8709fd8b98053de5f SHA-1: 76393852590880e7b2bfe9a9da9cc20c67c18e26 SHA-256: 1e09130a94b4ec11c99330b25dbdc6b1302cb64789ff07486d9460c6c0444265
184 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to known malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, appears to contain text related to Mathematica, likely a lure to disguise the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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/123?utm_term=how+to+plot+a+graph+in+mathematica In PDF document text
    • https://static.s123-cdn-static.com/uploads/4370299/normal_5fdeb2be1c921.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409818/normal_6002a7df91c51.pdfIn PDF document text
    • https://cdn.sqhk.co/nugopanage/tygi9xj/hitman_sniper_2_ios.pdfIn PDF document text
    • https://cdn.sqhk.co/galemojubemo/gghjJy7/joseb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501360/normal_6015015d8591c.pdfIn PDF document text
    • https://cdn.sqhk.co/mowanideju/wigyjhO/strike_fortress_box_apk_oyun_indir_club.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480408/normal_5fd9e08fa5df0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467927/normal_5fdfb7a6bce40.pdfIn PDF document text
    • https://cdn.sqhk.co/tikugosedik/iOWFmOh/95090673650.pdfIn PDF document text
    • https://cdn.sqhk.co/fajoliteve/wggirwl/724_area_code_canada.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386363/normal_5fff02af605ae.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bixoravu.epizy.com/jenetovagoke.pdfIn PDF document text
    • http://xojozefobulujox.epizy.com/nakigufidavifidosuto.pdfIn PDF document text
    • https://s3.amazonaws.com/rumezo/aws_cli_cloudformation_stack_output.pdfIn PDF document text
    • http://buvinisupolo.rf.gd/divide_et_impera_reforms_guide.pdfIn PDF document text
    • http://pebimomedunuzux.epizy.com/coreldraw_x7_bagas31.pdfIn PDF document text
    • http://fijinibegomiba.rf.gd/11090853303.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_off0000c9ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9AE 5220 bytes
SHA-256: 358445bf6384babf1d129e19a0ffd5aec4ef423544f7ffd2d61f09a6d0ac41c9
font_01_sfnt_off0000db5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB5A 12996 bytes
SHA-256: 78758b90fab62af79a04722db38a7a4689267bf967bef86c3101712ed20b16fc

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