Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4a12cdf81cb0a13…

MALICIOUS

PDF

67.8 KB Created: 2020-12-17 07:04:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: b007029a2e9f419ec6e416e94e71b648 SHA-1: 939bc2a51142e9fab62026242a99778812432637 SHA-256: a4a12cdf81cb0a13cd9d293a239f69c0a44191eac0c32413b217de187d3d20aa
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to a suspicious URL. ML classification and ClamAV also flagged this file as malicious. The embedded URL is likely intended to lure the user to a phishing or malware site, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://cctraff.ru/123?utm_term=munire+newport+crib+conversion+kit In PDF document text
    • https://wurilulisewanid.weebly.com/uploads/1/3/4/7/134728532/gukuvim_wunuxamojegix_fatowawuwita.pdfIn PDF document text
    • https://dowezepuxaku.weebly.com/uploads/1/3/4/4/134463959/b0474a.pdfIn PDF document text
    • https://fegikunula.weebly.com/uploads/1/3/4/4/134482285/8866349.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383146/normal_5fa31cc7919b2.pdfIn PDF document text
    • https://gimiduti.weebly.com/uploads/1/3/4/7/134711596/nesikafopuwi-giroraguja.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451930/normal_5fbf0141a28f0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/muvojugejoxip/heide_trask_senior_high_school.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c9f8fd8-330f-4bd2-bcbd-1a15ab75f6ee/makudanu.pdfIn PDF document text
    • https://s3.amazonaws.com/kevava/randolph_county_register_of_deeds.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/744c9192-328b-45f6-83b7-e4b4e4fa0485/melting_pot_by_anna_quindlen_summary.pdfIn PDF document text
    • https://s3.amazonaws.com/damerirazib/bible_training_centre_for_pastors.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn 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_off0000b8f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8F8 6812 bytes
SHA-256: 09993d2ce77ab7fe1c497bbed63e771043a95cd474ce79d95a2a50e6ede8176b
font_01_sfnt_off0000ca2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA2D 5048 bytes
SHA-256: f6cc97f59c4c7338924b5793b681937a932065cad2db2c80eee71566ba4cd60c
font_02_sfnt_off0000db8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB8D 10744 bytes
SHA-256: baacd9d66c940115f0d3f31b6dc563bbb7de84c81076e3dbfd6f147f6b5d52d7

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