Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea834bec67ff2792…

MALICIOUS

PDF

65.8 KB Created: 2020-11-24 13:56:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: da726932811e74b609e1793e3510364f SHA-1: d17f2a2b97a180a8e3055e3e2cff858a920f28b1 SHA-256: ea834bec67ff27922d6c5ba4fcf5d9475cb8298cc088407e0bd9a925e67090d8
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with the primary link directing to a known malicious redirector. This indicates a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly support the malicious verdict. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/aws?utm_term=android+studio+run+app+on+my+device
    • https://cdn-cms.f-static.net/uploads/4402032/normal_5f91929b97eab.pdf
    • https://gemenudotipetal.weebly.com/uploads/1/3/2/6/132695720/bulamulup.pdf
    • https://cdn-cms.f-static.net/uploads/4382193/normal_5f9749630d6fb.pdf
    • https://cdn-cms.f-static.net/uploads/4405443/normal_5f9da8693a754.pdf
    • https://milavigik.weebly.com/uploads/1/3/2/8/132815866/9a918cc3f2b.pdf
    • https://cdn-cms.f-static.net/uploads/4379720/normal_5f944b9ae3fbb.pdf
    • https://cdn-cms.f-static.net/uploads/4366044/normal_5f875dc9e196f.pdf
    • https://juvipafas.weebly.com/uploads/1/3/4/5/134583250/nubolore.pdf
    • https://zavomori.weebly.com/uploads/1/3/4/3/134335150/4b0bce359ff4c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/lokijuronig/65660820219.pdf
    • https://s3.amazonaws.com/rezugekolaba/bamoxujazu.pdf
    • https://s3.amazonaws.com/sebunuzu/happy_new_year_song_2019_bhojpuri.pdf
    • https://s3.amazonaws.com/welanisowari/what_font_does_the_nfl_use.pdf
    • https://s3.amazonaws.com/pilazi/lasitufeti.pdf
    • https://s3.amazonaws.com/zakunafu/19919703873.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c6fa.bin
ffa77c2e5b9efa11641be5ae2b65898a90c2bc1abee21f023d7d12edc370d505
pdf-font-stream PDF embedded font (sfnt) at offset 0xC6FA 5336 bytes
font_01_sfnt_off0000d91b.bin
7e0ae02af1e9acbb4fb0a89cbc4da8e1b71965900e91c9bed88866ef6035de90
pdf-font-stream PDF embedded font (sfnt) at offset 0xD91B 9816 bytes