Malicious PDF — malware analysis report

Static analysis result for SHA-256 174d48bfb4659762…

MALICIOUS

PDF

72.8 KB Created: 2020-11-09 20:57:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: f138e4633342930aecc2d8385f30f7a7 SHA-1: 68758d697b4e5d500c9cae040a76abe7788f23ac SHA-256: 174d48bfb4659762c5b23e9fa15ce861d5519b1d224f43525e34e76e035f684a
244 Risk Score

Malware Insights

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

The PDF contains a link farm designed to redirect users to malicious sites, as indicated by the 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SEO_LINK_FARM' heuristics. The document body, though heavily corrupted, appears to reference 'Kentucky fried chicken specials 2020', suggesting a lure to disguise the malicious intent. The presence of numerous PDF links hosted on disposable domains further supports a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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/strik?keyword=kentucky+fried+chicken+specials+2020 In PDF document text
    • https://pukotegifo.weebly.com/uploads/1/3/0/8/130874060/zugiruwagomegaw.pdfIn PDF document text
    • https://mejodulifewu.weebly.com/uploads/1/3/4/5/134526208/6564366.pdfIn PDF document text
    • https://sipasegeremiraf.weebly.com/uploads/1/3/4/4/134404187/378808.pdfIn PDF document text
    • https://letuwolisabir.weebly.com/uploads/1/3/4/6/134602086/wuwabitiram-jorote-jotagusije.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380086/normal_5f9d209d3bb99.pdfIn PDF document text
    • https://gozofuma.weebly.com/uploads/1/3/0/8/130874065/rugulunozutemo-jifejo.pdfIn PDF document text
    • https://rifodomofakape.weebly.com/uploads/1/3/4/6/134627700/27e5dd904.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368760/normal_5fa5758ad81e3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/32c6f4b1-c37c-45ea-ab5f-0ab0e380fbf8/millennium_3d_chess_rules.pdfIn PDF document text
    • https://s3.amazonaws.com/leguvefu/ancient_of_days_cityalight.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d14a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD14A 5424 bytes
SHA-256: be53e8c613bad2f830490745e2a2200e2a1f1f1f9b0b7b57248ec24617a11718
font_01_sfnt_off0000e3bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3BF 10828 bytes
SHA-256: 4c222e2e5e18c25ea198f6ccf016347197afe8ce27ac48af43764edadaa6eca1
font_02_sfnt_off00010862.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10862 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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