Malicious PDF — malware analysis report

Static analysis result for SHA-256 3577c5ea63909a1d…

MALICIOUS

PDF

77.0 KB Created: 2021-01-14 07:11:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: f9339022208a8d0e29114d5f0da8652a SHA-1: 18375715d3e911c4cff6fee949de2ae2b1c3c1a0 SHA-256: 3577c5ea63909a1d190a68cb3c118bc0bfe6049d03641ec104e14825a5adfd80
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is identified as malicious by multiple heuristics, including a critical finding that it links to known malicious redirector infrastructure and a critical finding of a PDF link farm. The ML classifier also strongly flagged the PDF. The embedded URLs suggest a phishing or malicious redirection attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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=ender%2527s+game+setting In PDF document text
    • https://cdn.sqhk.co/kitaparek/ghugfS5/card_scanner_software_free_download.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408330/normal_5fe56bdc0e297.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456671/normal_5fd3972a25de6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485015/normal_5fe849d406d65.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375342/normal_5fd2ebfa662f3.pdfIn PDF document text
    • https://wipibafupegivu.weebly.com/uploads/1/3/4/8/134868488/191b1d467d3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412775/normal_5fc5c1021420e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381551/normal_5f9657df6c492.pdfIn PDF document text
    • https://kafasomawupi.weebly.com/uploads/1/3/0/7/130775431/jomimikidizogiso.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449781/normal_5fe2dead3df72.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413867/normal_5fa5c50531687.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457011/normal_5fb8b2cd6f942.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/vufupu/wildly_important_goals_for_students.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_off0000efbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFBB 5104 bytes
SHA-256: 8a966e446d5978268a4557f1c9650315c76e56d2e7ef0fc29c1f0d26ee7b75da
font_01_sfnt_off00010106.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10106 10768 bytes
SHA-256: 84c11eabb0fe82d26fb301b4db210fa36f00b34f6cd2ac53b67a91f0fc633f49

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