Malicious PDF — malware analysis report

Static analysis result for SHA-256 b55c97881eb013ba…

MALICIOUS

PDF

78.3 KB Created: 2021-03-18 17:04:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: c9c7f1bd3216afd288b275485c7cffd9 SHA-1: 1a657d66b505523771c2362dacef668a8e004f82 SHA-256: b55c97881eb013baee5d4b8ba8c0f78e2f93a958c4d4868c809d755c003e2b87
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains an embedded URI pointing to a suspicious domain, which is likely used to host a phishing page or distribute further malware. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and 'Qt', suggesting it was generated by a tool rather than being a legitimate document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://xezojetit.ru/strik?utm_term=the+entertainer+simplified+piano+sheet+music PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4388412/normal_5fc5e5e43c358.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386594/normal_5fc769908a49e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384640/normal_602b480f807ca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444644/normal_6044a669ecb12.pdfIn PDF document text
    • http://muruxilirafet.iblogger.org/reporting_allegations_of_regulatory_misconduct.pdfIn PDF document text
    • http://pabukelib.66ghz.com/87002147909.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466661/normal_5fd839aaaa97c.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/90293283-42ea-4b23-be7d-b43828d280fd/dolokagowevuzobegafab.pdfIn PDF document text
    • https://s3.amazonaws.com/wukara/pepigaviguwanaj.pdfIn PDF document text
    • https://62abf401-5fc9-4991-ac00-cb6a0c8cf8ec.filesusr.com/ugd/e4ff69_c28968b4ab9044b9aafd4c61e8b471ac.pdf?index=trueIn PDF document text
    • http://bezopebadutaz.rf.gd/anti_plagiarism_checker_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e1b9daa-74ac-470e-b298-f87997d4ac33/4954629339.pdfIn PDF document text
    • https://91313464-3f42-441e-b0e8-b27065d471ad.filesusr.com/ugd/ee9d3f_f6f821be1b424dd5a33561d54215b8e9.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mogipegi/xefeda.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a2389575-508e-4541-9cab-e6e28152c05c/holy_quran_recitation_with_urdu_translation_video_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/lopeteb/80663963091.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/95322ef7-67a6-45c4-82f3-fb5df4238048/canon_mp240_user_guide.pdfIn PDF document text
    • http://balefowepinu.epizy.com/dejasorovuxak.pdfIn PDF document text
    • https://s3.amazonaws.com/xijalovelokolep/best_paid_android_apps_for_photography.pdfIn PDF document text
    • https://s3.amazonaws.com/luworizesupox/49342075815.pdfIn PDF document text
    • https://b7eb3c74-9f10-4efd-a612-efb7ea03662f.filesusr.com/ugd/7198c1_11930cd065094369b485d66b8e5a06b3.pdf?index=trueIn PDF document text
    • https://4de1274e-a26b-4e71-a0d1-d86f0cfee7ee.filesusr.com/ugd/ee4d88_0cc27558571b49bcb2f6d35e466e88f8.pdf?index=trueIn 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_off0000f04d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF04D 5344 bytes
SHA-256: 7dc1253b1a24a4584346a3c8a7b52644cd1e6403d1c2029a4a72191e5847cdbb
font_01_sfnt_off0001024e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1024E 12104 bytes
SHA-256: e9ff338f4d3a8fe3b0b6cd2e9b142aaa35b2051424041669ed6f35e4ec5fcdf8

Open this report in the interactive analyzer, or submit your own file for analysis.