Malicious PDF — malware analysis report

Static analysis result for SHA-256 aae70a68e1c16e57…

MALICIOUS

PDF

62.6 KB Created: 2020-11-18 20:48:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: b9c3bae50bdb84cdad114610fc1f81bc SHA-1: 954fb21829bb8f5798a2ed41bdfaed7d1258d3d0 SHA-256: aae70a68e1c16e57ee9b893feeecc028f792e2cd3663bded0e1b6401a3c72b22
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, many pointing to PDF files, suggesting a link farm or a method to obscure malicious destinations. The ML classifier and ClamAV detection strongly indicate maliciousness, with ClamAV identifying it as a phishing trojan. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic indicate an attempt to direct users to external resources, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://traffnew.ru/123?utm_term=molarity+by+dilution+worksheet+answers PDF link annotation
    • https://widubemevojapo.weebly.com/uploads/1/3/4/3/134320166/sadotawejavug.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370303/normal_5f8ac26fd313f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382421/normal_5f9c4555b717f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415291/normal_5f962e27d0192.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373304/normal_5fa2bf87d7c33.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404520/normal_5f9458f0cd8e3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/gawabog/10860145251.pdfIn PDF document text
    • https://s3.amazonaws.com/pesetufavo/90328945554.pdfIn PDF document text
    • https://s3.amazonaws.com/vabedafozo/jenofavozixigedur.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/77ed97e4-98a3-434b-86d7-3f1d986bdd49/mindset_the_new_psychology_of_succes.pdfIn PDF document text
    • https://s3.amazonaws.com/babuxufarizuxur/stellaris_vassal_research_agreement.pdfIn PDF document text
    • https://s3.amazonaws.com/baritexovopa/92788004850.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/485d9f27-aed1-4e9b-b477-2a66fe631b09/santrock_essentials_of_lifespan_development.pdfIn PDF document text
    • https://s3.amazonaws.com/kizugokofo/suxakekiwef.pdfIn PDF document text
    • https://s3.amazonaws.com/venunamazozuzo/b_m_w_bike_images.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_off0000af29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF29 5196 bytes
SHA-256: 1b47f36ff128885ccf1bf2cee8b74019ca8233d060b96ba2f4e4af327dab126d
font_01_sfnt_off0000c0de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0DE 9344 bytes
SHA-256: 9223fae8be86f53ed60d8e8a8b4e1926a20953211044edcf834ac767d7db86dd
font_02_sfnt_off0000df97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF97 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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