Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecb348a192a0f46f…

MALICIOUS

PDF

75.2 KB Created: 2021-01-19 19:07:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 913ed7cd66d7664134d4e56ee6d6c468 SHA-1: 137bd98b0e38bed6cf1fd60358ad6805eda1bc0a SHA-256: ecb348a192a0f46f4212befc781eb79191133164655f5b40562dfb80c29bae3d
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains embedded links to known malicious redirector infrastructure, specifically `https://gettraff.ru/123?utm_term=difficult+questions+to+ask+mormon+missionaries`. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to potentially malicious content, likely for phishing or malware delivery.

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
  • 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 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=difficult+questions+to+ask+mormon+missionaries In PDF document text
    • https://cdn-cms.f-static.net/uploads/4377902/normal_5f8d3c768c67e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405184/normal_5fd8a2312af3d.pdfIn PDF document text
    • http://xevidome.iblogger.org/bartholinite_cours.pdfIn PDF document text
    • http://lexanizisujufum.66ghz.com/48002620134.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465003/normal_5fe39de296238.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4530429/normal_5fbac3ecc9b0f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480748/normal_5feeaa2a68b1f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487903/normal_5ff6153bde24b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495691/normal_5fc865ac04d9e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374847/normal_5f93c879885a6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412761/normal_5fe5c2ea17326.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405437/normal_5f9ab6126be9e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://buguwotibiven.rf.gd/jivefijujamigekemamik.pdfIn PDF document text
    • http://feliruxitekul.epizy.com/eclipse_java_ide_for_mac.pdfIn PDF document text
    • http://fofuxolisemaxim.epizy.com/87011875143.pdfIn PDF document text
    • http://melaworogafema.epizy.com/rufosoluzuwajigejubipos.pdfIn PDF document text
    • http://jolavewavesuj.epizy.com/brain_out_level_145_answer_key.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_off0000e87a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE87A 5216 bytes
SHA-256: bb30af80231461ac6642bac6a36f74ef7dd44217b354154e3c3b740737b36db8
font_01_sfnt_off0000fa37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA37 10876 bytes
SHA-256: 1c33a2b1efd039336531ee5e727641da5f8a3c67b30d006d79cf903bb1424a15

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