Malicious PDF — malware analysis report

Static analysis result for SHA-256 8631ada6a03203db…

MALICIOUS

PDF

74.8 KB Created: 2021-02-24 22:47:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: be658bbddba4d3fc24712a321e62d73a SHA-1: 2fcd8a701a8ea4121963d5f3a594e448351060e5 SHA-256: 8631ada6a03203db81a8df71a5c2c704515972f3314aac0b55fa2a7fab1694a7
96 Risk Score

Malware Insights

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

The PDF file contains an embedded URL that mimics a search engine result, likely intended to trick the user into clicking it. ClamAV and ML classifiers strongly indicate malicious intent, classifying it as a phishing trojan. No scripts were extracted, but the presence of the malicious URL is the primary indicator of compromise.

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://jottigo.ru/wix?keyword=what+is+an+affidavit+of+eligibility PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4476416/normal_600547e9251e3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453901/normal_60219fbb42fee.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501998/normal_5fe69eb2b4e91.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455881/normal_6000afdff1c44.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383451/normal_6009e49328de7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366362/normal_5fcb49c3b34ba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414161/normal_603040401a96a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382430/normal_6006346455a0f.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/limewub/77790055954.pdfIn PDF document text
    • https://s3.amazonaws.com/seriposuj/colt_ar15_m4_handguard.pdfIn PDF document text
    • https://s3.amazonaws.com/vitelitubovuluj/novobas.pdfIn PDF document text
    • https://s3.amazonaws.com/dezajok/topic_sentence_worksheet_grade_2.pdfIn PDF document text
    • https://s3.amazonaws.com/jubiferekaka/59900640153.pdfIn PDF document text
    • https://s3.amazonaws.com/dowesitobuga/88978968358.pdfIn PDF document text
    • https://s3.amazonaws.com/godoremitiwuja/1856979697.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_off0000e75b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE75B 5388 bytes
SHA-256: 32fa7d6dcf41a2f92b2c0102f231ff9d27ead0d08d6f431a339f9310afee1886
font_01_sfnt_off0000f9c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9C8 10660 bytes
SHA-256: 64be5c4d7f4774c17f48a3a7e2dcd2e44df81624826ec6153d2666ac18983a41

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