Malicious PDF — malware analysis report

Static analysis result for SHA-256 942ea1e4d50b592c…

MALICIOUS

PDF

79.3 KB Created: 2021-02-23 01:41:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 6191c206a9f8b4b51f64de93babcf68c SHA-1: bcb3a525fc63210bc28729c5042b4601d6370247 SHA-256: 942ea1e4d50b592c492547aad8b2ef1bb6931d53afd665ffcc24cb8429180bb8
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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
  • 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://crophysi.ru/strik?utm_term=how+to+fix+a+turtle+beach+headset+cord PDF link annotation
    • https://cdn.sqhk.co/fuvebopeweb/zQEvicf/xivokevodu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369926/normal_5fc7681baa84d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414500/normal_600ae26c9d640.pdfIn PDF document text
    • https://zofoxutugutijor.weebly.com/uploads/1/3/0/8/130874595/8bfeeb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417325/normal_6032e6dccb9bc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426090/normal_60293b2469ef4.pdfIn PDF document text
    • https://fevuvewuvadudu.weebly.com/uploads/1/3/4/6/134650824/3586dc62c6c207.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371498/normal_5fdf197d57de4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458137/normal_5fc8795542b05.pdfIn PDF document text
    • https://cdn.sqhk.co/jekidase/rpgceB2/84698901947.pdfIn PDF document text
    • https://cdn.sqhk.co/miloniwuwave/iPPKiej/18976943306.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426550/normal_602381157bc98.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484994/normal_5ff1d0f16935f.pdfIn PDF document text
    • https://cdn.sqhk.co/wenewojufaj/aifidgj/directv_now_free_trial_2019.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366957/normal_601e94840e542.pdfIn PDF document text
    • https://cdn.sqhk.co/xojoreve/bjaNreV/poxirifagakikaxitup.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000f03b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF03B 5368 bytes
SHA-256: f8cddd0de8e61d033f99c26ef0cb42cb7b726c560fadf43912d2fad81ca2cc1e
font_01_sfnt_off00010287.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10287 14536 bytes
SHA-256: 9eb513596ba31304613021c2344f065cf1f01c088911e2894b58e8808c9e40dc

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