Malicious PDF — malware analysis report

Static analysis result for SHA-256 e521871f1326750e…

MALICIOUS

PDF

71.3 KB Created: 2020-12-26 00:19:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8b7f9430a310019d77a115a1d71ba009 SHA-1: 1ad14747bc3dec8caa986eb8e6eb1b8d71be11b9 SHA-256: e521871f1326750e117e4523a8c81d5c71cd0b7c0c32f0c367b4ecf036e37ce9
214 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, directing users to a URL associated with phishing. Additionally, it exhibits characteristics of a PDF link farm, with numerous external links, one of which is a known malicious redirector. The ML classifier also strongly flagged this PDF as malicious, and ClamAV detected it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/123?utm_term=breath+of+the+wild+download+size
    • https://palogipotutaz.weebly.com/uploads/1/3/2/8/132814365/7087130.pdf
    • https://cdn.sqhk.co/kefexunas/ibjdmig/31911174039.pdf
    • https://cdn.sqhk.co/vemikozoj/ZwMhjii/chinese_stress_balls_amazon.pdf
    • https://cdn.sqhk.co/lumozupa/E0ogcnA/70574985959.pdf
    • https://pufusotek.weebly.com/uploads/1/3/4/3/134376533/lunegumakazanuk.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/tuxutedi/calculator_vault_apk_old_version.pdf
    • https://s3.amazonaws.com/woneketelak/aviones_militares_espaoles.pdf
    • https://s3.amazonaws.com/tuxenipup/foobar2000_theme_guide.pdf
    • https://uploads.strikinglycdn.com/files/48691bab-36b8-4c77-baa7-d7cd48bc0de4/bilabisumobawutifomaze.pdf
    • https://uploads.strikinglycdn.com/files/1b4c3aa9-359d-46e9-8db1-9c6ca29995ec/garofuzubovurojewituse.pdf
    • https://s3.amazonaws.com/nitajosasa/jalopomanakezoxo.pdf
    • https://uploads.strikinglycdn.com/files/985566b0-2c6b-4353-98cc-32e02acac7a7/rudaxuzubewex.pdf
    • https://s3.amazonaws.com/zoxewudunigus/resident_evil_4_mobile_mod_apk_revdl.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_off0000d9bb.bin
45f4c07226e506c85a58804d7054189f6d6309f7b56ace48222e6ac843cb68bb
pdf-font-stream PDF embedded font (sfnt) at offset 0xD9BB 5184 bytes
font_01_sfnt_off0000eb76.bin
c174bda21599b8f43462d6e8fe7eebe549e1256505387a3be262c99355414243
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB76 10924 bytes