Malicious PDF — malware analysis report

Static analysis result for SHA-256 31a3fc73d0546aca…

MALICIOUS

PDF

124.7 KB Created: 2021-01-04 16:40:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 101edac320553a338e8a9b64f032420e SHA-1: 9db335124dd17a2511c5b0fafe513b48352bcdfb SHA-256: 31a3fc73d0546acaf45276a3e4e68452e189002ab88036a2fabddbe80f055bef
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a link to a known malicious redirector, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly support its malicious nature. Although no scripts were extracted, the presence of a malicious URL is a high-priority indicator.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://gettraff.ru/aws?utm_term=environmental+impact+assessment+report+requirements In PDF document text
    • https://static.s123-cdn-static.com/uploads/4368474/normal_5fef9991ee7a9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372072/normal_5f8deb9a1a656.pdfIn PDF document text
    • https://cdn.sqhk.co/ludukuni/UGgmMM5/ates_su_buz_devri_oyunu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387061/normal_5febc58739ef3.pdfIn PDF document text
    • https://cdn.sqhk.co/bepemuno/uihhegj/48774892564.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407810/normal_5f9630851ee75.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/gogunabones/kupozirejedibideliwasaka.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/75077b0f-ff7c-4449-b448-793246ab63d8/95702414698.pdfIn PDF document text
    • https://s3.amazonaws.com/likadojivivofu/dnd_5e_homebrew_class_template.pdfIn PDF document text
    • https://s3.amazonaws.com/pazovugal/index_match_google_sheets_different_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/dejolavubukugeb/brdm_vehicle_full_form.pdfIn PDF document text
    • https://s3.amazonaws.com/zuxime/gibev.pdfIn PDF document text
    • https://s3.amazonaws.com/remuv/spartacus_full_series_480p.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0768b01c-d0e4-4172-bb1b-efbafabae7de/planet_coaster_manual.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000186f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x186F7 5104 bytes
SHA-256: 71618cfc6a5f23dfec032cbd10623783fc13b1f53ba21de3d41632f012f40611
font_01_sfnt_off0001983a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1983A 13008 bytes
SHA-256: e00c7fac697b561d78b4614d67ec84ee4470ef39748e90a9d05668c2fed5feb4
font_02_sfnt_off0001c264.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C264 16028 bytes
SHA-256: 3e66ce8c90719045bf8f6c8d5f716325bbce29c89c8399c9e71e7e90b46a9b16
font_03_sfnt_off0001d6ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D6AD 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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