Malicious PDF — malware analysis report

Static analysis result for SHA-256 923583a63363406b…

MALICIOUS

PDF

90.1 KB Created: 2020-11-11 06:19:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: d339b9faa3077acaf7e48cebc50da90d SHA-1: 9fd383ca5149a94c3a0cec84c7816a3b90dc0d81 SHA-256: 923583a63363406b3ad93d050f57648666bf29a55eab3aa900ec82aeb135a122
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://traffmen.ru/aws?keyword=lab+safety+rules+worksheet+with+answers'. This indicates an attempt to lure the user to a potentially harmful website. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the embedded URL is the primary indicator of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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://traffmen.ru/aws?keyword=lab+safety+rules+worksheet+with+answers In PDF document text
    • https://cdn-cms.f-static.net/uploads/4444630/normal_5fa5526e59a9f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417312/normal_5f9c2275c13df.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393772/normal_5f9ab65eea27d.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/norozovijalu/98935360102.pdfIn PDF document text
    • https://s3.amazonaws.com/sitok/luzaluviruduvitibes.pdfIn PDF document text
    • https://s3.amazonaws.com/gebaxovudofe/gang_beasts_apk_download.pdfIn PDF document text
    • https://s3.amazonaws.com/lanorolowu/79992489272.pdfIn PDF document text
    • https://s3.amazonaws.com/gupawupigawono/54375685190.pdfIn PDF document text
    • https://s3.amazonaws.com/kisimujuk/list_of_animals_that_start_with_v.pdfIn PDF document text
    • https://s3.amazonaws.com/sepawi/archimedes_inventions.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_off00011b54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B54 2828 bytes
SHA-256: 4aba2bb845853324476be69e5ed1bf4ff35002942389efac2b843cac1129f0e9
font_01_sfnt_off0001254f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1254F 5196 bytes
SHA-256: a6d647bd8d8659566ea0a5727fa5a67db4b5e4cd608aa440a65cc02dfab63399
font_02_sfnt_off00013712.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13712 10020 bytes
SHA-256: 4ea4a8025ad29eeccdf893de176ea340c6553099d69e36d00a2732f1505513dd