Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4b8940b4c2f0a1c…

MALICIOUS

PDF

58.6 KB Created: 2020-11-25 21:55:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 0f1bcd5b98ea5bca46f876dece81f121 SHA-1: 39284bed103c14427042825d1b8ca187d7d702f5 SHA-256: c4b8940b4c2f0a1c2ec8049eb72594d1e4ecc7e58f5a43780775d54d5820a2d8
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical finding for a PDF link farm and ClamAV detection as a phishing trojan. The embedded URLs, particularly 'https://trafficel.ru/strik?utm_term=sebec+lake+webcam', suggest a lure to a malicious site, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and link farm indicate an attempt to redirect users to potentially harmful content.

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 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.
  • 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://trafficel.ru/strik?utm_term=sebec+lake+webcam PDF link annotation
    • https://zebatezovas.weebly.com/uploads/1/3/4/6/134618099/3289745.pdfIn PDF document text
    • https://jakedekokobara.weebly.com/uploads/1/3/1/3/131381480/jolon_koxuzozudanik_makilitinami.pdfIn PDF document text
    • https://kofusozefo.weebly.com/uploads/1/3/4/5/134515267/e600abe.pdfIn PDF document text
    • https://nakumupapetiz.weebly.com/uploads/1/3/2/7/132741615/giresevifexasedulo.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/fulosobezur/morrish_s_real_discipline_quotes.pdfIn PDF document text
    • https://s3.amazonaws.com/bezutu/calendario_judio_5780.pdfIn PDF document text
    • https://s3.amazonaws.com/mozedijiz/11771995329.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fbe1aa33-b506-40f4-9e39-a21a7e11f14d/26232465553.pdfIn PDF document text
    • https://s3.amazonaws.com/wapabefizosumi/zoledronic_acid_infusion_cpt_code.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab272e1c-2e38-43f9-ae99-51d96554cba9/11980318272.pdfIn PDF document text
    • https://s3.amazonaws.com/tenunud/zuniradow.pdfIn PDF document text
    • https://s3.amazonaws.com/sazixipame/39641285003.pdfIn PDF document text
    • https://s3.amazonaws.com/ruzaganog/shih_tzu_puppies_for_sale_riverside_ca.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_off0000aabe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAABE 5068 bytes
SHA-256: 971f60dcb0b702a48592309b84d001d0f90175c66b7389ff2589a5c94d15de8b
font_01_sfnt_off0000bc0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC0A 10164 bytes
SHA-256: a5ae1173fcb46915d4293ec64acf9360a6d6861fb63773ae51530a745f58da80

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