Malicious PDF — malware analysis report

Static analysis result for SHA-256 78c93d8e95155fca…

MALICIOUS

PDF

68.7 KB Created: 2020-11-18 08:05:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 83d5d1c10d3e981adc7c9f53bdc19ba2 SHA-1: 20cf3c8c157caac929a0c4ee653083be63e6f24b SHA-256: 78c93d8e95155fca08a1c82847758a79f04935fec6e147952472c66b82852e9d
244 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to disposable hosting or redirector services, indicating a link farm designed to distribute malicious content or phish users. The primary malicious URL identified is 'https://ggtraff.ru/strik?utm_term=libro+el+arte+de+amar+descargar+gratis', which is flagged as a malicious redirector. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ggtraff.ru/strik?utm_term=libro+el+arte+de+amar+descargar+gratis In PDF document text
    • https://cdn-cms.f-static.net/uploads/4417205/normal_5fa98316d569b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378378/normal_5f92f91ca282f.pdfIn PDF document text
    • https://dasitonaz.weebly.com/uploads/1/3/4/3/134379343/fimoguzep-gupotodegu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366982/normal_5f872a171a34b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391340/normal_5f9ba5c5c0fb6.pdfIn PDF document text
    • https://xotuwajugi.weebly.com/uploads/1/3/4/3/134349857/jutedotero.pdfIn PDF document text
    • https://wepugimi.weebly.com/uploads/1/3/1/0/131070973/592bb2139.pdfIn PDF document text
    • https://vixijusodu.weebly.com/uploads/1/3/0/7/130776714/tonufederodewa-gexaravuwoxaw-xemonofufubi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494440/normal_5faa2536937e2.pdfIn PDF document text
    • https://damijuvik.weebly.com/uploads/1/3/1/3/131381376/resujedefovalex.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392661/normal_5f8f83cd3cba4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379726/normal_5f911b1d0ef6f.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/vuterijoze/kumon_1st_grade_math_worksheets.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cde360a3-ebac-4880-90b0-403568568e5c/68304198384.pdfIn PDF document text
    • https://s3.amazonaws.com/jolufozo/71282640850.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_off0000cead.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEAD 5340 bytes
SHA-256: 62da22e7cddb13e395698a7a553392f16688a19f7f964af8c0ff17a16768292a
font_01_sfnt_off0000e0bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0BD 11372 bytes
SHA-256: 4dca29bbe7f081664add6ba881a9c2616c9b5af863afe888101e7c43a1dd254b

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