Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d15e5b4b2dca47d…

MALICIOUS

PDF

70.3 KB Created: 2020-11-17 04:03:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: fb1ccfa4d09854c0f4ff38b1b924478f SHA-1: b026c01a074d5e3760a36eaf800c60a8648b89b5 SHA-256: 1d15e5b4b2dca47d2b6e2f19e08c46d42c0dd9fa718c4260ce7cab125195723b
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 a machine learning classifier, indicating it is likely a phishing or redirector lure. It contains numerous embedded links, many pointing to disposable hosting services and a known malicious redirector, suggesting an attempt to drive traffic to potentially harmful sites. The document body, though heavily obfuscated, contains metadata related to 'Emotional labour and burnout' and the authoring application 'wkhtmltopdf', which may be part of a social engineering pretext.

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=emotional+labour+and+burnout In PDF document text
    • https://deroguba.weebly.com/uploads/1/3/4/6/134684347/lubizesutab-zuxiwowupepim-sexevotalikome.pdfIn PDF document text
    • https://letolikasepa.weebly.com/uploads/1/3/4/6/134625664/sagorozujani_mufed_putubekolupaw_duzuwedijusu.pdfIn PDF document text
    • https://forunevelaviwa.weebly.com/uploads/1/3/4/3/134392474/3069996.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383917/normal_5f8c65c262b11.pdfIn PDF document text
    • https://jarapitoxedomel.weebly.com/uploads/1/3/1/4/131437170/1811083.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480387/normal_5fa7318fe0e26.pdfIn PDF document text
    • https://fejisamuzek.weebly.com/uploads/1/3/4/6/134636520/816f02342bc4ba.pdfIn PDF document text
    • https://guzebiba.weebly.com/uploads/1/3/4/3/134368687/gigat.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/5953555c-a2bb-4123-9d16-beb01cd16b9e/xukexukesudeviluzatop.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/33c38f39-b235-4039-9680-9896425a690f/love_nikki_game_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d69f07ed-7760-472b-b370-15a90b367dec/google_website_search_console.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3183aee8-c05e-4736-8bf4-200ef45dce70/61120686494.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b18a041-4632-4e33-adae-1b895b9b5e23/mirawewuxuxomafavujuxego.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_off0000d756.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD756 4892 bytes
SHA-256: 09f3d31a3d3cac498e504d1d4fc59ca77adc12de9b1d68cde2695c2b7d7fd1cb
font_01_sfnt_off0000e7d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7D9 10908 bytes
SHA-256: b5f2dc4ebf62a14ab8b3e5870ed7defff780f783b23fc654d94d9dfe13334de1

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