Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf7ef4dd215fdd9d…

MALICIOUS

PDF

69.9 KB Created: 2021-01-17 10:06:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 6f987098949333d7de4b5b6c4df4e7a8 SHA-1: eff4001ae6dd7caa6a71d2428b7ebc9f31ee8363 SHA-256: bf7ef4dd215fdd9d2e42a614d511e3a9936cd0c9f237cd9a86aa410589ff2372
244 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of embedded URLs, many of which point to disposable hosting or known malicious redirectors. This indicates a phishing or scam attempt designed to lure users to malicious sites. The ML classifier and ClamAV detection strongly support the malicious nature of this document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • 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.
  • 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.
  • 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=recycle+symbol+5+microwave In PDF document text
    • https://cdn.sqhk.co/rajexizeba/jdHThgm/eset_mobile_security_antivirus_apk_download.pdfIn PDF document text
    • https://ketibavobatuver.weebly.com/uploads/1/3/4/8/134849788/papuxeziguwalivexoge.pdfIn PDF document text
    • https://cdn.sqhk.co/fixakozumad/hGjfdgi/59552033566.pdfIn PDF document text
    • https://site-1171554.mozfiles.com/files/1171554/i_m_a_barbie_girl_song_lyrics.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479439/normal_5fdc376582e9c.pdfIn PDF document text
    • https://kivisibef.weebly.com/uploads/1/3/0/7/130775328/repujapasumunadeb.pdfIn PDF document text
    • https://favesalaliba.weebly.com/uploads/1/3/1/3/131384568/148a2c4ad.pdfIn PDF document text
    • https://site-1206689.mozfiles.com/files/1206689/pikalolebax.pdfIn PDF document text
    • https://kinigapiluxuke.weebly.com/uploads/1/3/4/8/134863840/jefaki.pdfIn PDF document text
    • https://jerejadudet.weebly.com/uploads/1/3/0/7/130738914/104da719385d426.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_off0000d3d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3D6 5468 bytes
SHA-256: 55eb701a4cac55ef72867613e670c50b94fffc2fa1214b10c9d0fb0ecf6c3749
font_01_sfnt_off0000e67f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE67F 10620 bytes
SHA-256: c0b8dad51516d27aa68bab4af15214852ae3e83b6df0971b684940af5b4ad74c

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