Malicious PDF — malware analysis report

Static analysis result for SHA-256 b26bd7bf5a293097…

MALICIOUS

PDF

89.9 KB Created: 2021-02-17 05:16:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 15953adad46b4a843f58f69c36dc3f65 SHA-1: 3231006e5cc44bf1c7cc5ac0bef30284e3ddaa26 SHA-256: b26bd7bf5a293097d246c19394b3f767df729b82306f33ebfbf5faae36279223
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file is a PDF document that contains an embedded URI pointing to a suspicious domain, identified by heuristics and ClamAV as malicious. The ML classifier also strongly flagged this PDF. While no scripts were extracted, the presence of the malicious URL suggests an attempt to redirect the user to a phishing or malware distribution site. The document body is heavily obfuscated and appears to be malformed, further indicating malicious intent.

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
  • 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://crophysi.ru/strik?utm_term=chemical+formula+of+hydrogenated+palm+kernel+oil PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4412378/normal_5fcaca4f2721a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476601/normal_5febc3eeb1f28.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/panalipolifod/mobogenie_apk_hack.pdfIn PDF document text
    • https://s3.amazonaws.com/gadumagabusodel/69579613508.pdfIn PDF document text
    • https://s3.amazonaws.com/fatisake/95311108023.pdfIn PDF document text
    • https://s3.amazonaws.com/jenagubadopi/precalculus_with_limits_3e_chapter_5.pdfIn PDF document text
    • https://s3.amazonaws.com/marimejerebo/carcinoid_heart_disease_guidelines.pdfIn PDF document text
    • http://kotumeberi.rf.gd/identifying_theme_worksheets_with_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/baxunaf/xemarosavutemuripekinofu.pdfIn PDF document text
    • https://s3.amazonaws.com/napoledunadigo/knee_replacement_surgery_valgus_deformity.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_off000115be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115BE 2960 bytes
SHA-256: 4253ce374f546ed82c0b962bfad5e193173c5af7311640f7068ccdda2cb38311
font_01_sfnt_off0001203f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1203F 5460 bytes
SHA-256: 856cbb06040b4c5cdae06fd152205216a6502ab8c7b4422ecc3c6be35becd711
font_02_sfnt_off000132ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132AE 11692 bytes
SHA-256: 4fc62438f89aa865530ba88efb5d2fc1c230dbb34947490fbf0049e5ba6babf8

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