Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5358dc30b18a533…

MALICIOUS

PDF

74.1 KB Created: 2021-02-02 22:53:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 49645b99f23e6da5b4ebd1f35171a8cf SHA-1: 0088a475cd0cdad7fd3b35248b8b3e687b124556 SHA-256: a5358dc30b18a53358212c91b3babbef87556df6430abbf9b12f3a080a7f400d
96 Risk Score

Malware Insights

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

The file is a PDF document that contains an embedded URL pointing to a suspicious domain. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The document body, though partially corrupted, suggests a lure related to educational worksheets, aligning with common social engineering tactics.

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://baarspo.ru/aws?utm_term=incomplete+sentence+worksheets+2nd+grade PDF link annotation
    • http://videohost.space/nizipebetoo4mys.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446382/normal_5fdbe0ed20647.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378599/normal_5fce5ee09b716.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381320/normal_5fdbe358c6f6e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450421/normal_600c73be544f7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481058/normal_5fff3e61d99b8.pdfIn PDF document text
    • https://cdn.sqhk.co/wofunukasu/egj8ibW/country_friends_royse_city.pdfIn PDF document text
    • https://cdn.sqhk.co/furaxofir/hjbJZgc/descargar_five_nights_at_freddy_s_2_apkpure.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486758/normal_6013928c0ea19.pdfIn PDF document text
    • https://cdn.sqhk.co/buzivafulet/I3Aqpjb/75289359450.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448341/normal_5fedd0bc5d0cd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413225/normal_5fd6a2afbc220.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/xijuxosisomuna/39517108708.pdfIn PDF document text
    • https://s3.amazonaws.com/mavixu/73581461189.pdfIn PDF document text
    • https://s3.amazonaws.com/dazuxujepov/mozilla_firefox_portable_free_zip.pdfIn PDF document text
    • https://s3.amazonaws.com/midaguvimabof/inequalities_problems_with_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_off0000e38d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE38D 5712 bytes
SHA-256: 03bbe9ddf33ff38a75d7560bdc921f6c8956677dc3cc337f4d19d78a17f01998
font_01_sfnt_off0000f6e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6E2 10520 bytes
SHA-256: 9bd1ac6528e2b2bf1e64ce495b27840f2b36fde0d54ca4520bfd358fe0427d90

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