Malicious PDF — malware analysis report

Static analysis result for SHA-256 56a20273085687fb…

MALICIOUS

PDF

76.4 KB Created: 2021-02-04 02:42:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: c9c01f039a7bb86c95d86cac55244971 SHA-1: 7f177545d411d1c4dbf3f7bf263b0c2c50b7858d SHA-256: 56a20273085687fb3027854139c6a52583101b981bddedd0cfc5bc346e15c61b
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristic analysis revealed it functions as a link farm, embedding numerous external URIs across various disposable domains. While no scripts were explicitly extracted, the presence of many external links suggests the document is designed to redirect users to potentially malicious websites, likely for phishing or malware distribution.

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
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://leonvi.ru/wb?keyword=carcassonne%20spielregeln%20pdf PDF link annotation
    • https://jumuwaxenu.weebly.com/uploads/1/3/1/4/131406560/4053603.pdfIn PDF document text
    • https://nofuzibid.weebly.com/uploads/1/3/1/4/131453406/7757784.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495849/normal_6000b735e27ed.pdfIn PDF document text
    • https://goxejebifebiv.weebly.com/uploads/1/3/2/6/132682819/gimufopobi_zafanagutil_tefazixegumari_fizavaj.pdfIn PDF document text
    • https://bonifivudinuf.weebly.com/uploads/1/3/4/3/134305406/105344b.pdfIn PDF document text
    • https://cdn.sqhk.co/karadirimose/aighjjg/68059154180.pdfIn PDF document text
    • https://nimuneroz.weebly.com/uploads/1/3/1/4/131407882/6285642.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365551/normal_5fc9ddc123839.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4472773/normal_5fc96de0498fa.pdfIn PDF document text
    • https://pojekemo.weebly.com/uploads/1/3/4/4/134469054/vomedo.pdfIn PDF document text
    • https://cdn.sqhk.co/tuseliwi/WRbFG9B/fashion_cover_girl_makeup_star_mod_apk.pdfIn PDF document text
    • https://zafewogi.weebly.com/uploads/1/3/1/4/131407253/5b116.pdfIn PDF document text
    • http://haifaiv.ru/banodezotajelokjuwl.pdfIn PDF document text
    • https://cdn.sqhk.co/nomavunut/bje2czj/badlands_national_park_map.pdfIn PDF document text
    • https://mexukisigugat.weebly.com/uploads/1/3/4/7/134702857/sajifonisunogik.pdfIn PDF document text
    • http://verification-help.com/bible_catholic_versionht4ck.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://surobufalinaxis.epizy.com/android_studio_sharedpreferences_get_value.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e35b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE35B 5228 bytes
SHA-256: 8552f651b6631243d69175124a1c1b75837bb33d50ebf9a6e655f4eee3293fdd
font_01_sfnt_off0000f525.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF525 1800 bytes
SHA-256: 6d2a3a16cc464ce72cf05976c7f96a31c93af2202e0dc760c37a694345e222ee
font_02_sfnt_off0000fdb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDB5 11092 bytes
SHA-256: d6e103ab9881c49cc8352b4caa155859f08e2ecf058993a2f44c9265aa167383

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