Malicious PDF — malware analysis report

Static analysis result for SHA-256 7684034a332d27fc…

MALICIOUS

PDF

73.5 KB Created: 2020-12-17 23:42:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: dd9a95386fc5afda18ff062db90b5a06 SHA-1: bf6efb0c7b9d5beaf7e3fe887e06e22a2a036137 SHA-256: 7684034a332d27fcaeba2946f4c1b6e8fdcc329c17f706acab3d21c1e4b08b2f
244 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and an ML classifier, and ClamAV detected it as Pdf.Phishing.Trojan. The file contains a large number of embedded URLs, many pointing to disposable hosting, and at least one URL is known to lead to malicious redirector infrastructure. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, and the presence of numerous links indicates a link farm or phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://ggtraff.ru/strik?utm_term=seattle+school+spring+break+2017 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4495240/normal_5fbcbc878329b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367646/normal_5faa677581e3a.pdfIn PDF document text
    • https://dagigofeno.weebly.com/uploads/1/3/4/8/134887245/b32a047.pdfIn PDF document text
    • https://lijemokuw.weebly.com/uploads/1/3/4/8/134853622/5a480.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369762/normal_5f8937e16ff93.pdfIn PDF document text
    • https://botubadixebom.weebly.com/uploads/1/3/1/4/131407995/vanetigut-jowiv-reralizisovuzox.pdfIn PDF document text
    • https://genigudepa.weebly.com/uploads/1/3/1/0/131070712/bekalan.pdfIn PDF document text
    • https://kuxiwidozerapi.weebly.com/uploads/1/3/4/7/134728536/184ff4a6912.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/gowebabuxogiro/words_that_start_with_dad.pdfIn PDF document text
    • https://s3.amazonaws.com/busutafitufe/60122634139.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fdd6e326-a71f-414c-9c64-09b820f29371/28850168351.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc2a934a879396864138857/t/5fc710708f0796361571c8f4/1606881393746/magic_dream_tiles_download.pdfIn PDF document text
    • https://s3.amazonaws.com/bakoloj/resmed_bipap_user_manual.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_off0000e1f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1F0 5908 bytes
SHA-256: 5d3057d537ee375143f4f1fcab98cd0478498eca5146a10d3662ef215dbc67e9
font_01_sfnt_off0000f60b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF60B 10180 bytes
SHA-256: 46242f013ada9c477efe68a65eb174d8a621b8bde2d1419cb5b0415b1f02c216

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