Malicious PDF — malware analysis report

Static analysis result for SHA-256 6394dfe4c4635cab…

MALICIOUS

PDF

71.8 KB Created: 2021-01-11 10:08:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 5d58340aa1f0c61d5293c8c34236a02a SHA-1: d1f9919091eb48d53f3c8ef9c690b813beec48ae SHA-256: 6394dfe4c4635cab87da201a79f5005d3923c4470337066d1ac7f53b6e4eaa46
214 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, with at least one identified as a malicious redirector. The heuristic firings indicate a PDF link farm and a ML classifier strongly flagged the document as malicious. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics suggest an attempt to redirect users to malicious content, likely for phishing or malware distribution.

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
  • 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.
  • 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.
  • 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://traffking.ru/aws?utm_term=acca+f8+dec+2014+answers In PDF document text
    • https://rigawolazi.weebly.com/uploads/1/3/4/7/134710531/xupot.pdfIn PDF document text
    • https://site-1168192.mozfiles.com/files/1168192/rudowovafusotarigipunaru.pdfIn PDF document text
    • https://site-1176958.mozfiles.com/files/1176958/block_craft_world_game.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402262/normal_5f98ee7b9ed19.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380213/normal_5f8ca2e86cb1a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372074/normal_5f952001586a3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482426/normal_5ff962ff72206.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418788/normal_5fc34f24da943.pdfIn PDF document text
    • https://site-1168027.mozfiles.com/files/1168027/87823292286.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/daraniwekamidir/rusiwobagidugazepu.pdfIn PDF document text
    • https://s3.amazonaws.com/fomaralunex/56601291745.pdfIn PDF document text
    • https://s3.amazonaws.com/jewizopukuni/52048072795.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_off0000d278.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD278 5672 bytes
SHA-256: fd1fbc4bab0b4a10f0bf3f1bb6abd2b0706b7cc3d984fbabd878cd494b5a7a8f
font_01_sfnt_off0000e5ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5EF 1800 bytes
SHA-256: 51ebeec29509b87aa858d500e37ac8853184703d07d1f913ce36d8e1dc7764c0
font_02_sfnt_off0000ee7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE7D 10516 bytes
SHA-256: e71c6259a5cd3eac4f79bec86a66351110fe58e3146854a99070b4cf0de76c1d

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