Malicious PDF — malware analysis report

Static analysis result for SHA-256 55bd8a5b03d2120d…

MALICIOUS

PDF

68.5 KB Created: 2020-11-13 04:35:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 148a4a288605e53ec5d39834eded8740 SHA-1: 7af20fa1511303b5a88a8e8a7124ac1810ffb115 SHA-256: 55bd8a5b03d2120dc02ba184755589108d972a6838f98fe7adc1c1b7c32c4f9f
214 Risk Score

Malware Insights

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

This PDF file was flagged by multiple critical heuristics as malicious, including a redirector link and a link farm. The ML classifier also strongly indicated maliciousness. The embedded URLs suggest the document is designed to lure users to external sites, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://ggtraff.ru/aws?utm_term=confined+space+entry+checklist+template In PDF document text
    • https://vozutadisifik.weebly.com/uploads/1/3/1/4/131483249/pazituneviwow.pdfIn PDF document text
    • https://zepixufiguw.weebly.com/uploads/1/3/4/1/134108583/zidiwamosekusapo.pdfIn PDF document text
    • https://kafaziwe.weebly.com/uploads/1/3/1/0/131070109/e4abb6a56dc.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/felasorarabipis/zugezodinuduvovobir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f0ff671e-9160-423d-81c4-a3b5fbe04d77/18369601504.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/12c89ba6-ab07-41b7-99d7-ab152e9beb7a/lidakaparuwezixufimi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/682a86af-71c0-4f9a-9448-ce3516383215/82314134822.pdfIn PDF document text
    • https://s3.amazonaws.com/zonebon/rumafukijiputew.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4abc57cc-d98b-4006-b528-8669850116e9/27769745308.pdfIn PDF document text
    • https://s3.amazonaws.com/zuguvoxoki/curwin_and_mendler_7_principles.pdfIn PDF document text
    • https://s3.amazonaws.com/fasanag/elektrik_arpmasnda_ilk_yardm.pdfIn PDF document text
    • https://s3.amazonaws.com/jusuberu/5798350865.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d19f08b3-c56f-4d1f-8614-ad32783dc10f/mil_dtl_5541.pdfIn PDF document text
    • https://s3.amazonaws.com/labitajaxatufib/82587162390.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_off0000d010.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD010 5464 bytes
SHA-256: abf2f9b9d5e229a8196497fe216ff87fc7dd30d2afba49b194afaf594cdd3a21
font_01_sfnt_off0000e289.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE289 10108 bytes
SHA-256: 3bedbe631f3fb952d9262bf80344488367f285d7bd8ac4676b1c129fc218c901

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