Malicious PDF — malware analysis report

Static analysis result for SHA-256 a093def92c4776d5…

MALICIOUS

PDF

80.3 KB Created: 2021-02-23 20:24:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 6310ed8190ef10b5c10048dfec2f1aea SHA-1: 8c09004770fe11e48e17915e2a3286d3d32e85f2 SHA-256: a093def92c4776d52309c008e4482b85db9c42db176b10b4c8386cf3e1c6223a
154 Risk Score

Malware Insights

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

The PDF contains embedded links pointing to known malicious redirector infrastructure, specifically `https://yafferge.ru/strik?utm_term=netgear+wnce2001+universal+wireless-n+internet+adapter`. This URL is likely used to deliver a phishing page or a second-stage payload. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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.
  • 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/strik?utm_term=netgear+wnce2001+universal+wireless-n+internet+adapter In PDF document text
    • https://cdn.sqhk.co/dorodidur/vdt4jb1/edge_lighting_samsung.pdfIn PDF document text
    • https://cdn.sqhk.co/galemojubemo/PShhhhg/briefing_a_case_example.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383805/normal_6029ae6f4e2c8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444370/normal_5fffd9587d363.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453337/normal_6002b493999d1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411932/normal_5fcea31336a84.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387709/normal_602423692725c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417990/normal_5fe0846aa597a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485448/normal_5ffcf62ade210.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410191/normal_602d65face7a6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447280/normal_5fc7e1de4db89.pdfIn PDF document text
    • https://cdn.sqhk.co/zikegasenar/gUFvQhb/kubitakoz.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://s3.amazonaws.com/tapexiw/chromedriver_default_directory.pdfIn PDF document text
    • https://s3.amazonaws.com/nowokil/grams_moles_calculations_worksheet_iii.pdfIn PDF document text
    • https://s3.amazonaws.com/domegagowevag/bible_for_java_jar.pdfIn PDF document text
    • https://s3.amazonaws.com/fovezewi/what_stage_of_cellular_respiration_does_chemiosmosis_occur.pdfIn PDF document text
    • https://s3.amazonaws.com/xufujofaleki/a1_sheet_size_in_cms.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_off0000ec00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC00 5492 bytes
SHA-256: 2c10e73cca5024bbbd789b68f87359f86c3ac4b42f9918c2b31383b86ee1d1c9
font_01_sfnt_off0000fee1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEE1 10892 bytes
SHA-256: f4c3686a67c2ddffd2a1c2614460315a52c8f6ca113d2c91264916dda55d82f2
font_02_sfnt_off000123d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123D7 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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