Malicious PDF — malware analysis report

Static analysis result for SHA-256 975dfbb4d922f1c9…

MALICIOUS

PDF

110.2 KB Created: 2021-01-12 08:17:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 725f4230fc70ace25270c50b30c74685 SHA-1: ecda412e52a35dcea71b7f5358694740f0c1f393 SHA-256: 975dfbb4d922f1c9614a655da6c1b9959fa35b6a8e566ea283bdf05f282c005a
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains numerous embedded links, with one specifically identified as a redirector to malicious infrastructure. The heuristic firings indicate a PDF designed as a link farm, likely to distribute phishing content or malware. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://traffking.ru/123?utm_term=priority+pass+lga In PDF document text
    • https://site-1168481.mozfiles.com/files/1168481/66012144751.pdfIn PDF document text
    • https://vuxofuta.weebly.com/uploads/1/3/4/2/134235669/somexijamevelaze.pdfIn PDF document text
    • https://tufelovewojamex.weebly.com/uploads/1/3/4/3/134331554/fafifononesonu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365649/normal_5fcd50923c0da.pdfIn PDF document text
    • https://site-1177263.mozfiles.com/files/1177263/37508287068.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419425/normal_5fe1406f5c12c.pdfIn PDF document text
    • https://cdn.sqhk.co/dodagirojep/Thdl7hT/18148833970.pdfIn PDF document text
    • https://cdn.sqhk.co/salefudodid/jihhwBr/38072462422.pdfIn PDF document text
    • https://site-1177196.mozfiles.com/files/1177196/the_triple_alliance_of_1907.pdfIn PDF document text
    • https://tanorejenajid.weebly.com/uploads/1/3/1/0/131071151/nexefuwazi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381735/normal_5fb7c7724de42.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469103/normal_5fdebbd6215c2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485321/normal_5fcbfe83d3268.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473041/normal_5faf7489610fc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411694/normal_5fad532ad79d2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off00016cc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16CC6 5088 bytes
SHA-256: 729dc525344379ee678a499a408fea61315ad1d2424266d6f52fe333a75ecddd
font_01_sfnt_off00017e2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17E2D 13804 bytes
SHA-256: b26088848663cb99333ed87e885a82d00b6ab95dc9ef52272c365c80069e1cdb

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