Malicious PDF — malware analysis report

Static analysis result for SHA-256 56f47b756125519d…

MALICIOUS

PDF

80.3 KB Created: 2020-12-15 22:27:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 136bffeaf5fcd72cef8fefe0fd4eb126 SHA-1: 8e735f40a2fb8cff8daa79ddb92b611e98310a7f SHA-256: 56f47b756125519daef2cf8ed2fbc3c5fb845ee6bf63fb2e799ac16efa4a127f
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic identifying it as a malicious redirector and a link farm. One of the primary links directs to a known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO abuse.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://gettraff.ru/123?utm_term=pse+fang+crossbow+reviews In PDF document text
    • https://cdn-cms.f-static.net/uploads/4370059/normal_5fa3b678f399f.pdfIn PDF document text
    • https://kabijibijeg.weebly.com/uploads/1/3/4/9/134900291/53661d54bd2eed.pdfIn PDF document text
    • https://lawagupavuraxap.weebly.com/uploads/1/3/4/6/134616311/7707980.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/c5d5bd41-6869-4b51-8ef6-7ee69618d2cf/duzibageditegu.pdfIn PDF document text
    • https://s3.amazonaws.com/tazibabebamep/goliwikodarakin.pdfIn PDF document text
    • https://s3.amazonaws.com/rodigapigeta/6458532174.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/13d422c1-2e7e-40a6-9721-4410da937b14/champion_5500_watt_generator_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/jumedemimo/necromancy_spell_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e111100-fca6-450d-851c-c4f0f1fbd44f/free_mobilink_internet_setting.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a885512-b37e-408e-b0a7-0dee1c6d855e/40167996843.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc59b6cbda9c57a97de3b41/t/5fc61ff4145a8629dc82e6bc/1606819831767/supimajimeguloruze.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/afa5ddb8-27f0-4b75-ba92-1f254fb03f68/2606012762.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_off0000ff50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF50 5308 bytes
SHA-256: 81df9a09a3512b6abcc0a3e989fba513c6d3f5f044141c7ffd088a10dcf8c929
font_01_sfnt_off00011192.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11192 10204 bytes
SHA-256: cc5884ff542c238dedb227d008d0e096fd0550360774f541c8a42b76a1afb5e8

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