Malicious PDF — malware analysis report

Static analysis result for SHA-256 257874aa44491091…

MALICIOUS

PDF

92.0 KB Created: 2021-01-26 08:48:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 7491b8699804cb416925c771f71a98aa SHA-1: 005fd5c046b653f1010fed3e780874c6166e0d84 SHA-256: 257874aa44491091f0051970bf86651ac670115052bdbe1e8f35a28a0f1d4de8
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains an embedded URI pointing to 'trafffi.ru', which is likely used to redirect the user to a phishing site or download a secondary payload. Although no scripts were explicitly extracted, the PDF structure and embedded URI suggest an attempt to exploit vulnerabilities or trick the user into navigating to a malicious resource.

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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://trafffi.ru/123?utm_term=the+terms+%25E2%2580%259Cnaturalistic+art%25E2%2580%259D+or+%25E2%2580%259Crealistic+art%25E2%2580%259D+are+sometimes+used+to+describe PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4427267/normal_5fe9ff751eec8.pdfIn PDF document text
    • https://cdn.sqhk.co/tubafejog/g56mOhj/mentha_oil_price_live_today.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427538/normal_5fe964c875a2c.pdfIn PDF document text
    • https://cdn.sqhk.co/tuteremekome/Fjgijhf/golden_boot_race_uk_premier_league.pdfIn PDF document text
    • https://cdn.sqhk.co/sileluzorupo/9l3qe8w/51594222808.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478146/normal_5fe7b5780b9d5.pdfIn PDF document text
    • https://cdn.sqhk.co/bufutoje/ghhbjdi/24530724956.pdfIn PDF document text
    • https://cdn.sqhk.co/tusifefovozu/bl7Vedn/pegaxarelek.pdfIn PDF document text
    • https://cdn.sqhk.co/buwozumu/zgce8QC/boxoxuxisalite.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368985/normal_5fce4e20d1962.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/dalava/23357367233.pdfIn PDF document text
    • https://s3.amazonaws.com/lokijuronig/13245851369.pdfIn PDF document text
    • https://s3.amazonaws.com/fobupojowojon/darkest_dungeon_guide_for_beginners.pdfIn PDF document text
    • https://s3.amazonaws.com/minegikukovel/41306580216.pdfIn PDF document text
    • https://s3.amazonaws.com/nefagolom/84081800288.pdfIn PDF document text
    • https://s3.amazonaws.com/wovigebi/afterlight_apk_android_1._0._6.pdfIn PDF document text
    • https://s3.amazonaws.com/salade/knowledge_base_microsoft_access_template.pdfIn PDF document text
    • https://s3.amazonaws.com/fadobirak/guillain_barre_syndrome_treatment.pdfIn PDF document text
    • https://s3.amazonaws.com/sixolose/everfi_module_9_investing_quiz_answers.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_off000127c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127C2 5444 bytes
SHA-256: e373f83b9c8a4fe1fa0a73df67743fdabaf69e470255ab40a611f24636dd6050
font_01_sfnt_off00013a08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A08 10748 bytes
SHA-256: 9bfc96346ad5a3e1e5248d74da6ae5a2d94c57a59ad6e4282f553efda87c3237

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