Malicious PDF — malware analysis report

Static analysis result for SHA-256 7cee83efbd42a118…

MALICIOUS

PDF

166.3 KB Created: 2021-01-20 21:21:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: d31db0daf9ee56724b6383aae0328bb1 SHA-1: b1de6db41533acdf882cf878a0b4b434313fb561 SHA-256: 7cee83efbd42a1187c0a864b6b5422d99238f81b816fb381cabb6f5a3e7dfd0b
184 Risk Score

Malware Insights

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

This PDF file contains multiple embedded links, with at least one pointing to known malicious redirector infrastructure. The heuristic firings indicate it is a malicious redirector and part of a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly support its malicious nature, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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=manual+braille+embosser In PDF document text
    • https://site-1176018.mozfiles.com/files/1176018/detective_story_jack_s_case_mod_apk.pdfIn PDF document text
    • https://site-1174503.mozfiles.com/files/1174503/zenadagipakidori.pdfIn PDF document text
    • https://site-1178304.mozfiles.com/files/1178304/warfare_incorporated_mod_apk.pdfIn PDF document text
    • https://site-1177879.mozfiles.com/files/1177879/15550826571.pdfIn PDF document text
    • http://dipurenirexo.22web.org/snickers_informao_nutricional.pdfIn PDF document text
    • https://site-1244787.mozfiles.com/files/1244787/corso_di_formazione_agricoltura_sociale.pdfIn PDF document text
    • https://cdn.sqhk.co/vusutazomaga/oie0BtZ/33401887660.pdfIn PDF document text
    • https://site-1247322.mozfiles.com/files/1247322/video_editor_free_for_macbook.pdfIn PDF document text
    • https://site-1177219.mozfiles.com/files/1177219/biceps_tendon_exercises.pdfIn PDF document text
    • https://site-1185944.mozfiles.com/files/1185944/bawivupipakofapavifirakev.pdfIn PDF document text
    • https://site-1173507.mozfiles.com/files/1173507/korean_hangul_printable_writing_worksheets.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://viwuleraxukopiz.epizy.com/aashiqui_3_full_movie_2016.pdfIn PDF document text
    • http://bavidoripo.epizy.com/48538038904.pdfIn PDF document text
    • http://zuwapiw.rf.gd/change_background_color_android_activity.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_off000251a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x251A8 4976 bytes
SHA-256: 5d7b653ce1fe9f0d4ceec05c22186405f70537138fb08e22a565167ca32e252b
font_01_sfnt_off00026284.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x26284 12696 bytes
SHA-256: ebf57f01d24a70f872eedf5d74d2fac17fe98b779136b0366e1b85fb105c9d16

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