Malicious PDF — malware analysis report

Static analysis result for SHA-256 486ed3e92b43488a…

MALICIOUS

PDF

73.4 KB Created: 2021-04-09 15:44:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: f0663d26446f676a0b05c06610ac8911 SHA-1: 243dabe9358bfee9946db7299de8f99f0f114ee3 SHA-256: 486ed3e92b43488aebcb254bd83e41cc3d9eb16cb04340c40326852c2e621ce1
186 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, many pointing to disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, likely used as a lure for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://xezojetit.ru/strik?utm_term=how+to+use+sharp+carousel+convection+microwave PDF link annotation
    • http://vizezokope.iblogger.org/sebepipetujalu.pdfIn PDF document text
    • http://sanasojan.22web.org/uebnice_eskho_jazyka_pro_cizince.pdfIn PDF document text
    • http://kismykeitio.best/skyrim_german_language_pack_razor1911_download3thhk.pdfIn PDF document text
    • http://zelenege.iblogger.org/biochemistry_usmle_questions.pdfIn PDF document text
    • https://kezodedekupamo.weebly.com/uploads/1/3/4/6/134605888/7372383.pdfIn PDF document text
    • http://gavixed.iblogger.org/brixton_spatial_anticipation_test.pdfIn PDF document text
    • http://sqrab.top/bhojpuri_song_2019_dj_remix_video1fw6s.pdfIn PDF document text
    • https://taxinureku.weebly.com/uploads/1/3/0/8/130814469/weloni.pdfIn PDF document text
    • http://tutavizukatafoz.22web.org/calendario_laboral_barcelona_2020.pdfIn PDF document text
    • http://hookup671.site/what_is_the_rarest_eye_color_for_blondes5f3zf.pdfIn PDF document text
    • https://vipekisurular.weebly.com/uploads/1/3/1/4/131453387/jitefunuxawogu.pdfIn PDF document text
    • http://ehaberdevlet.com/550039891765xmd2.pdfIn PDF document text
    • https://zaketedojerobi.weebly.com/uploads/1/3/6/0/136023974/mukepaje-medami.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://435a888a-8f80-410d-aa77-77edd6e4491d.filesusr.com/ugd/51fec0_932c475ee678423799bb5f4f90693191.pdf?index=trueIn PDF document text
    • https://ebc1add8-0b9d-418e-9e4a-1e287827e933.filesusr.com/ugd/ab63e3_a5c1dc68d829428ebb07d220bf52f0a8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/buponuwebi/messenger_lite_terbaru_2019.pdfIn PDF document text
    • https://e216d865-ddc7-438b-99b2-64609380b1bb.filesusr.com/ugd/7ae8b3_5cce45953ec640818843b04887cd8b95.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xamibebulosaxug/23907878024.pdfIn PDF document text
    • http://watuvul.epizy.com/puzuwo.pdfIn PDF document text
    • https://1fc3e790-19e1-43b7-bae7-d09a953f51fe.filesusr.com/ugd/2c608b_7cacb3bc7869486dabfd65d99a5d6da9.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rovuweraja/b_ed_result_2019_kuk.pdfIn PDF document text
    • https://s3.amazonaws.com/kakef/gejinodasegudaweko.pdfIn PDF document text
    • https://3c86e5df-9a55-47dd-9d5b-c207b25ec6cd.filesusr.com/ugd/72bf36_985c60d240064e1d8f2b8eadf04d350e.pdf?index=trueIn PDF document text
    • http://dowixewobi.epizy.com/public_relations_n5_textbook.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_off0000e049.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE049 5288 bytes
SHA-256: f9a030239f02d04c32e73d16fd2a847adb9029f63b9dd4893990b0ed9e25528a
font_01_sfnt_off0000f22e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF22E 11112 bytes
SHA-256: 25635c4191711048259e81d8186cf40ca355214c54394a55d256c79bd224d5e7