Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc944278c126c20f…

MALICIOUS

PDF

66.4 KB Created: 2020-12-19 20:11:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 6c1c7b3e346a2f81ce09179ab6b3efb9 SHA-1: fbd9cf0d160d42968e5679cbace72f74e4db5598 SHA-256: dc944278c126c20f6db14f60bba7e622171bc02ad95f1ffbb4ede975a8859e18
214 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, including one pointing to a known malicious redirector. The document body, though heavily obfuscated, contains text related to a 'Windows media player update free', suggesting a phishing lure. The presence of numerous external PDF links, some pointing to potentially malicious infrastructure, indicates a link farm or redirection scheme designed to lead the user to malicious content.

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/aws?utm_term=windows+media+player+update+free In PDF document text
    • https://lizitizesibegip.weebly.com/uploads/1/3/4/6/134685526/jibet-kidixazisu-jivixavajisugi-gokujonozeraxa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415326/normal_5fa7504812be9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380536/normal_5f9277a3582c3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474211/normal_5faf80f6a3179.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447270/normal_5fa4ad981abfd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485015/normal_5faaf182e2eb5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384026/normal_5fd39ba55a382.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/c27b066b-3c0f-4ecd-995a-b4793775a2ab/lb_aces_scheduling.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/36b29ba4-4e07-478b-9c75-31d23b8e4489/android_oyun_club_hileli_clash_of_cl.pdfIn PDF document text
    • https://s3.amazonaws.com/zafijukopa/zikiroverefugika.pdfIn PDF document text
    • https://s3.amazonaws.com/fomudebipefasu/tibop.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_off0000c746.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC746 5396 bytes
SHA-256: c9b67127437f7bf93218e519e3c92173617434527f99a3d77110e6da3c15eb35
font_01_sfnt_off0000d9a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9A1 10280 bytes
SHA-256: a54862d766765e2c7bcf3d9de97d9e166f3ba61242fa5242b308bf3c7e1fbe6b

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