Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7a824182eb82e70…

MALICIOUS

PDF

72.0 KB Created: 2021-02-23 00:55:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 52c38fa846d5f9722f7d754adfa03bc0 SHA-1: 3e9bb09c07ba5d63472bce7d4a39f8048c99dc35 SHA-256: c7a824182eb82e70aefd38b0c8db1f128704e07c1608ce6c4a69516c98d0ae34
184 Risk Score

Malware Insights

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

The file is a PDF that has been flagged by multiple heuristics, including a critical alert for linking to malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness. While no scripts were extracted, the presence of numerous embedded URLs, one of which points to known malicious infrastructure, suggests a phishing or malware delivery attempt. The document body contains garbled text, indicating it is not intended for human consumption but rather as a lure or container for malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://crophysi.ru/strik?utm_term=difference+between+team+leader+and+project+manager In PDF document text
    • https://cdn-cms.f-static.net/uploads/4413375/normal_601634e267208.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454043/normal_5fe4d86f7aa59.pdfIn PDF document text
    • http://fewobamuge.iblogger.org/liftmaster_close_error.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492275/normal_602faf5d7e777.pdfIn PDF document text
    • http://arthromedro.xyz/tedum4czlg.pdfIn PDF document text
    • http://famesodelazij.22web.org/67641949877.pdfIn PDF document text
    • http://swast-group.website/13153165687whkfh.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453575/normal_5ff4101d48f2e.pdfIn PDF document text
    • http://yourbigdick.space/exercices_complement_de_phrase_cm1k7acu.pdfIn PDF document text
    • http://euroshopme.site/tawisesoduworo8ea77.pdfIn PDF document text
    • http://robertferrell.net/feboriwifujalo95bl.pdfIn PDF document text
    • http://fesilax.22web.org/74014918414.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kewuzelaxapog.rf.gd/mla_citation_format_scholarly_article.pdfIn PDF document text
    • https://s3.amazonaws.com/jivuxo/12177077964.pdfIn PDF document text
    • http://jovelabomitom.epizy.com/absage_bewerber_formulieren.pdfIn PDF document text
    • http://gobavaduxa.epizy.com/deadpool_1_movie_tamil_dubbed.pdfIn PDF document text
    • http://bibobega.epizy.com/bhima_nadi_information.pdfIn PDF document text
    • http://nozumipoz.epizy.com/southern_cassowary_fact_sheet.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_off0000db84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB84 5604 bytes
SHA-256: 6f5bc829edeaaeab533f8bb219cf3c8622e544be3e494d2422797ff81c06df02
font_01_sfnt_off0000ee97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE97 10664 bytes
SHA-256: 3a83d971c2a01209f5b003ab4a6524eb2957b1bcce5c4c16209d7f252f4bae9c

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