Malicious PDF — malware analysis report

Static analysis result for SHA-256 a647fd921e2fe441…

MALICIOUS

PDF

83.3 KB Created: 2021-03-21 21:49:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 69f67c98f032b16ab141c6cee3c5718f SHA-1: 3478e0d30971d5870e80ea879e0a3422cea25e57 SHA-256: a647fd921e2fe44155d0d03dba424b57268903996ad19c40dcf6f66fd1248e22
126 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The ML classifier strongly indicates maliciousness. While no scripts were extracted, the PDF structure and embedded URIs point towards an attempt to redirect users to potentially malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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://kuzutuzo.ru/strik?utm_term=asus+aimesh+rt-ac66u+b1 PDF link annotation
    • https://guxitokos.weebly.com/uploads/1/3/2/6/132681611/6681441.pdfIn PDF document text
    • https://cdn.sqhk.co/ledusefugize/njaPdjc/vamerukowebomeluwepa.pdfIn PDF document text
    • https://lidonamu.weebly.com/uploads/1/3/4/7/134722791/judifolose.pdfIn PDF document text
    • https://ponosozuvovisu.weebly.com/uploads/1/3/4/6/134668850/8849722.pdfIn PDF document text
    • https://viwoxewadekam.weebly.com/uploads/1/3/4/0/134016770/5416534.pdfIn PDF document text
    • https://dogopakuva.weebly.com/uploads/1/3/4/6/134698139/paxarixowevax_fegeb_rikaxedevi.pdfIn PDF document text
    • https://buritozube.weebly.com/uploads/1/3/0/7/130775753/divazig.pdfIn PDF document text
    • http://decideyouself.fun/drown_out_overwhelm_crossword_cluel9mso.pdfIn PDF document text
    • https://dakuzewaki.weebly.com/uploads/1/3/6/0/136089440/6484447.pdfIn PDF document text
    • https://cdn.sqhk.co/gimenuxot/ib2hima/erebus_and_terror_bodies.pdfIn PDF document text
    • https://nokibuvekunel.weebly.com/uploads/1/3/1/1/131164430/dojajapigodo.pdfIn PDF document text
    • https://woninulanomawij.weebly.com/uploads/1/3/4/6/134670754/3882d.pdfIn PDF document text
    • https://napifilimikap.weebly.com/uploads/1/3/1/6/131606974/340996c9.pdfIn PDF document text
    • https://jufavufopu.weebly.com/uploads/1/3/4/3/134340263/zalafu_lepanilovi_kefinupexu.pdfIn PDF document text
    • https://cdn.sqhk.co/rogudokives/fJXSHzs/15660798147.pdfIn PDF document text
    • http://ig-socialmedia.xyz/how_to_join_cia_clandestine_servicegc9xo.pdfIn PDF document text
    • https://disovipogazita.weebly.com/uploads/1/3/1/3/131398104/dinofepigusu-sarawubariwi-xofixarowoka-jedejunix.pdfIn PDF document text
    • https://lonunirixug.weebly.com/uploads/1/3/2/7/132710494/fifadipir.pdfIn PDF document text
    • https://muxiduxipa.weebly.com/uploads/1/3/5/3/135319221/5974772.pdfIn PDF document text
    • http://padojuputiki.iblogger.org/6th_grade_science_practice_test.pdfIn PDF document text
    • http://milky-rp.space/marriage_morals_in_islam89neu.pdfIn PDF document text
    • https://cdn.sqhk.co/xukigipeduve/XRhjJhb/81100443908.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://danudur.epizy.com/song._pk_application_for_android.pdfIn PDF document text
    • http://luzeparuzibez.rf.gd/kavurutolo.pdfIn PDF document text
    • http://misopepiwabaju.epizy.com/orbitales_moleculares_sigma_y_pi.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_off0000f836.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF836 5376 bytes
SHA-256: 274814a2ad09d57cc0332c0a5011c3c855fa91a87f0d1ba34bdd26ff829a01ee
font_01_sfnt_off00010a61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A61 23652 bytes
SHA-256: 220ae6b79bf480d81a9cbc714d4fcc3d007f7088f14890d48ddacb267dd250cc