Malicious PDF — malware analysis report

Static analysis result for SHA-256 0aaca9c1d5065d40…

MALICIOUS

PDF

60.9 KB Created: 2021-01-04 00:56:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 8ee24a71481f7b4da5339c74a1e3cca3 SHA-1: bb18687b84e623e2791fa3dbb577c3e3e10caa13 SHA-256: 0aaca9c1d5065d40346401851a1e4d4c87ed82cca43838e3eff4892e00a5872c
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 redirector infrastructure and potentially malicious domains. The heuristic firings indicate the PDF is a malicious redirector and part of a link farm, designed to drive traffic to external sites. The ML classifier and ClamAV detection strongly support its malicious nature. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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
  • 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://gettraff.ru/aws?utm_term=punjabi+song+obsession+by+upkar+sandhu In PDF document text
    • https://cdn.sqhk.co/zapakolozu/iQjjJPc/27081111063.pdfIn PDF document text
    • https://mujolimu.weebly.com/uploads/1/3/4/8/134868529/pukunugijodeju.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414873/normal_5f9a694c2fda8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4494452/normal_5fee1166002b1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485010/normal_5ff23f581c69f.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/kefiperizonofu/bimanual_palpation_dental.pdfIn PDF document text
    • https://s3.amazonaws.com/sizadagazagaj/95159842431.pdfIn PDF document text
    • https://s3.amazonaws.com/jizubisetebof/kepulunixem.pdfIn PDF document text
    • https://s3.amazonaws.com/gonima/jedi_sentinel_kotor.pdfIn PDF document text
    • https://s3.amazonaws.com/polojuliragam/56035127141.pdfIn PDF document text
    • https://s3.amazonaws.com/debamijizozexo/ladadanavupo.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_off0000ad5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD5E 5572 bytes
SHA-256: 787a3b7469446f75e2bdab652248de810e3816af40d72a8f4fb5bef4e48c8494
font_01_sfnt_off0000c056.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC056 11640 bytes
SHA-256: 58aa81c76070a3ae68752f1a7d99740b08b0ef02cdc8ea20a42185efea6a2d5e

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