Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0ed6a6b04ef1422…

MALICIOUS

PDF

77.1 KB Created: 2021-05-14 19:57:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: de678c13bd996b97977b5c233714778c SHA-1: 31b012c0b545a0e9374f5d6c007249afa5dbd73a SHA-256: a0ed6a6b04ef14224b1606ead61585ae0dcde1c94f34e3c1aab99b28724109c9
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was identified as malicious by multiple heuristics and an ML classifier. It contains numerous embedded links, many of which point to disposable domains and redirectors, indicating a phishing or scam attempt. The primary malicious activity observed is the redirection to external, potentially harmful, URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://dafemum.ru/strik?utm_term=4+words+level+23 In PDF document text
    • http://rumafelaneli.mygamesonline.org/acute_abdomen_adalah.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489599/normal_5fc9a2af9bc6b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389084/normal_5ffa585647af4.pdfIn PDF document text
    • https://delidago.weebly.com/uploads/1/3/0/9/130969485/51886b7e81827.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403414/normal_601f11db11da3.pdfIn PDF document text
    • https://cdn.sqhk.co/lunapolakezo/jpsjasL/file_hide_android_app_download.pdfIn PDF document text
    • https://fewusivusezul.weebly.com/uploads/1/3/4/2/134236316/sanunukigefuz-jeperudakod-figidemoz-jotaso.pdfIn PDF document text
    • http://rubewox.sportsontheweb.net/kojivabugas.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366668/normal_60692589be682.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454671/normal_5fc6ae1d476c9.pdfIn PDF document text
    • https://refefutetolesom.weebly.com/uploads/1/3/4/8/134868450/fipofoje.pdfIn PDF document text
    • https://cdn.sqhk.co/kewawukufiju/5SicazP/english_linduo_hd.pdfIn PDF document text
    • https://wanesutilujat.weebly.com/uploads/1/3/4/8/134868149/959e4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a0ac902-4fcd-4efb-8a0c-17f2a9dce2cd/industrial_electrical_schematic_symbols.pdfIn PDF document text
    • http://vowajug.rf.gd/47436475225.pdfIn PDF document text
    • http://ligafima.rf.gd/mosuvasodiforabedi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/524445e7-a6fb-4688-9041-f67cbaa7ecc6/kozex.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e21dce2-e61f-44d8-98f2-8933ffa35b6a/how_to_install_waves_plugins_fl_studio_20.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/892d8a33-0dfa-4538-8c53-80534a2977f3/should_the_word_professor_be_capitalized.pdfIn PDF document text
    • http://tapomizo.rf.gd/limirifamem.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0be89467-ba3f-4a26-98b8-9b1c3530782f/how_to_make_page_breaks_in_wordpad.pdfIn PDF document text
    • http://lobaman.epizy.com/manuscript_speech_guidelines.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA6B 5052 bytes
SHA-256: 79f7020c948966bf5d3e402b3fb29facb721c925eb6e60c0cf5c7a656c421a2b
font_01_sfnt_off0000ebca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBCA 11064 bytes
SHA-256: 22969286dc3e8bca95e3d55eef050a970c967289599bde10e66010718e08b884
font_02_sfnt_off000111bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111BF 16204 bytes
SHA-256: e93acd332f5893643511f4cefd38969ad5c744ad1b08842a788b6be7d277dd15