Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f398ac098259774…

MALICIOUS

PDF

67.9 KB Created: 2020-11-22 06:03:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ed3eac727c72f68569a964df2b5557e3 SHA-1: 4bace119d2fcb03593d74eee778e4b6d8ba0454b SHA-256: 7f398ac0982597749b33c52125ce7abef1796f3150be75924afe3cdf9a3869f6
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to known malicious redirectors or link farms. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to lure users to external, potentially harmful, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/123?utm_term=list+of+words+with+ly+prefix
    • https://ninuwekij.weebly.com/uploads/1/3/4/6/134625354/pizaf.pdf
    • https://mawokivujuruti.weebly.com/uploads/1/3/4/6/134685386/6670544.pdf
    • https://mogilifus.weebly.com/uploads/1/3/0/7/130739831/059d55fbff3.pdf
    • https://xonujofepip.weebly.com/uploads/1/3/4/3/134385468/8a1a23601.pdf
    • https://kojemugolipoxo.weebly.com/uploads/1/3/4/7/134729864/dolusapidabigi.pdf
    • https://cdn-cms.f-static.net/uploads/4475730/normal_5fadf380e8361.pdf
    • https://cdn-cms.f-static.net/uploads/4422659/normal_5f9a728533d1c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/setaxilitozuko/gosipobumuzulasuf.pdf
    • https://s3.amazonaws.com/rodigapigeta/59437246731.pdf
    • https://s3.amazonaws.com/nuxulikiwab/wexaf.pdf
    • https://s3.amazonaws.com/pajukovuxetu/furosiguxetan.pdf
    • https://s3.amazonaws.com/pezofut/watch_harry_potter_7_part_2_online_123movies.pdf
    • https://s3.amazonaws.com/pewebopufupe/all_passive_forms.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c9ff.bin
80460a25610aeec6203bda3adfe5af15febc6c95a1b9382bc092d57f103d6e54
pdf-font-stream PDF embedded font (sfnt) at offset 0xC9FF 5124 bytes
font_01_sfnt_off0000db8a.bin
67962c83ebce10dcad162239fe3d4c3f5d3371a1695adcabc2b41010f64113c6
pdf-font-stream PDF embedded font (sfnt) at offset 0xDB8A 11620 bytes