Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b69c74d172efaa7…

MALICIOUS

PDF

79.9 KB Created: 2021-03-25 10:17:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 06965f85989be6202b1cb77af4c20dbd SHA-1: efc57dcc76b9c8fc2a849d6bc0b4c503a4f8f4c8 SHA-256: 6b69c74d172efaa755c9662b12db82c11c1cf6fd91926bee6506226f9480bce5
214 Risk Score

Malware Insights

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

The sample is a PDF file flagged by multiple critical heuristics as malicious, including linking to known malicious redirectors and being part of a link farm. The ML classifier also strongly indicated maliciousness. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect the user to malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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://dafemum.ru/award?keyword=blendtec+recipes+pdf In PDF document text
    • https://ribavazo.weebly.com/uploads/1/3/5/3/135322422/busozesebuvi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375896/normal_601f08a6bf517.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373281/normal_6005e064c1db2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483345/normal_60489cd3290cf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373004/normal_6027df7c0a75d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488807/normal_602a0d9adc876.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380881/normal_5fe0acb9510cb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445341/normal_6041522a30336.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381289/normal_601fa87da9d82.pdfIn PDF document text
    • https://likizosuzi.weebly.com/uploads/1/3/4/8/134886942/vosujiwetijo_mifusezegelo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481988/normal_5fcbdd87e48ce.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368229/normal_6000c9321813a.pdfIn PDF document text
    • https://kinofipu.weebly.com/uploads/1/3/4/7/134725163/9051011.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483839/normal_603e85486eaba.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473041/normal_5ff3867975adc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460048/normal_604e95d92810b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444850/normal_601833cabd5e2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455198/normal_6055387a77207.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404984/normal_5fdf31bdad152.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380084/normal_601ef20263470.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467912/normal_5fd78c3e598e4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385424/normal_5fd2238676084.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/6378cd88-23a5-4c92-b6d2-79312da47e51/voxumimosuloxavamivozefol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/507c2fe2-db15-43cc-b746-cf751315e9ba/how_to_fill_transmission_fluid_honda_odyssey.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/74db2bed-0e29-46a5-ac30-d22884ef32fd/davugivodikexovitifap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c4c38b5-ecb8-455c-ade1-6f6f5a36bda6/the_boy_in_striped_pajamas_summary_movie.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_off0000fc8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC8E 4988 bytes
SHA-256: 6b63e81e363564d8b651314de612bb1f1d46e7502809d78ab326741934f1392b
font_01_sfnt_off00010d9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D9A 10980 bytes
SHA-256: 72f8246b81670705459c8e03660e9964ea45186ce1b4d25d96397485c8531218