Malicious PDF — malware analysis report

Static analysis result for SHA-256 d84777f2606b1557…

MALICIOUS

PDF

61.0 KB Created: 2020-12-25 03:43:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 7727d5ad703acf2890c185aff63c287d SHA-1: 9998e95a5438fbd5e9196ce9641fa49d8ff53c2e SHA-256: d84777f2606b1557ddd128f8c754a316d8dccc59a82037f15e7cd916533bf4c3
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a significant number of embedded URLs, with critical heuristics indicating that many of these links point to known malicious redirector infrastructure and a PDF link farm. The ML classifier also strongly flagged this PDF as malicious. While no scripts were extracted, the sheer volume of suspicious links suggests a phishing or scam campaign, likely delivered as a spearphishing attachment.

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://cctraff.ru/strik?utm_term=connect+the+dots+online+game In PDF document text
    • https://cdn.sqhk.co/gemadaruvow/jcTghps/pocketmine_plugins_list.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367938/normal_5fdb9ba44007e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368245/normal_5f8c5ecf33cdc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446152/normal_5f9ed80b46a04.pdfIn PDF document text
    • https://texifafotolatip.weebly.com/uploads/1/3/4/7/134764930/zodabosazenijifopeg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384822/normal_5fdab19660234.pdfIn PDF document text
    • https://pimedoxeniku.weebly.com/uploads/1/3/4/6/134640330/6838214.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384468/normal_5fa10aee5ee51.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/nitirew/jikuzut.pdfIn PDF document text
    • https://s3.amazonaws.com/miledu/rupapizufevadorur.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_off0000b538.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB538 5160 bytes
SHA-256: 992c175b427555aa2312897cf9b862b76bf5578ab1cf013f391d733d01f82418
font_01_sfnt_off0000c69c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC69C 9700 bytes
SHA-256: 8ecffd8f08c2c74b9beb75cae416b554f15ab834976d48a341d9f9c4b4895d7a

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