Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba142bb27403f569…

MALICIOUS

PDF

81.7 KB Created: 2021-02-15 09:06:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: a9bc7e6fcbf630a9fa3bf00b2c61a7ee SHA-1: 47251060b6b516021d2885eeffd2fa37866a5f45 SHA-256: ba142bb27403f569933b11c50136ff1219942d3e7631e4d423094f4085b7f722
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a critical heuristic identifying it as a link farm. One of the primary external URIs, 'https://baarspo.ru/aws?utm_term=classifying+real+numbers+worksheet+answer', is likely a phishing or malware distribution lure. Although no scripts were explicitly extracted, the PDF structure and the presence of external links suggest an attempt to redirect the user to a malicious site, potentially for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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=classifying+real+numbers+worksheet+answer PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4457573/normal_5ffb26ca914d4.pdfIn PDF document text
    • https://vakofariz.weebly.com/uploads/1/3/1/4/131438137/denafazuzagafog-kusikobadafudan-nalataxeberuwe-xuwexaferit.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469633/normal_5ff90083194fc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391903/normal_601a2f29a886b.pdfIn PDF document text
    • http://microbestdigitalmeter.xyz/pimopizuvurijerifazaxq2xf1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417049/normal_5fe05c72ee9c6.pdfIn PDF document text
    • http://prosale.company/magic_castle_centerville_ohqp3h2.pdfIn PDF document text
    • http://byseles.xyz/69227848555t3fjw.pdfIn PDF document text
    • http://samettemiz.xyz/my_first_summer_in_the_sierra_john_muir25mx6.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/fejenijovekozu/pejoziloxinolaf.pdfIn PDF document text
    • https://s3.amazonaws.com/nazekisigiduz/us_billboard_top_100_songs.pdfIn PDF document text
    • https://s3.amazonaws.com/boxujetanonikuv/amazon_appstore_for_android_tv.pdfIn PDF document text
    • https://s3.amazonaws.com/vuterijoze/1447527404.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_off000104b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104B5 5484 bytes
SHA-256: 0040129d1fc2a876c243617b9167e0d2e96613509799aae7889b65c10cda91f5
font_01_sfnt_off0001174d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1174D 10160 bytes
SHA-256: ec45bd1c08f2ac655a68ba022b0ed2393381d2aa7ce561f86b5bcc65ce33797c

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